Overpower :7mana::symr:
Instant
Destroy target creature. Then, Overpower deals damage equal to that creatures converted mana cost divided as you choose among that creatures controller and creatures that player controls. Creatures that player controls can't block this turn.
Griffin Stable :3mana::symw::symw:
Enchantment
:2mana::symw: : Put an Aura enchantment token into play with "Enchant creature you control" and "Enchanted creature gets +2/+2 and has flying".
When Griffin Stable leaves play, put two 2/2 Griffin creature tokens with flying into play.
Why is Blue / White Boros? It ought to be Azorius... Boros is Red / White.
However, here is the next card:
Robot Factory
Artifact
X , : Put a 0/0 construction creature token named Clockwork Robot into play with X +1/+1 counters on it and "Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat.".
XX : Put X +1/+1 counters on target construction.
Brainburn :3mana::symr:
Instant
As an additional cost to play ~, remove any number of cards from the top of your library from the game.
Brainburn deals X damage to target creature or player, where X is the number of cards removed from the game this way. (I think you wanted it to work like this) If Brainburn would deal damage to a player, that player may put half that many cards from the top of his or her library to his or her graveyard instead.
Next:
Loxodon Warrior :symg::symw: Creature - Elephant
Trample, Lifelink
At the beginning of your upkeep, you may put a +1/+1 counter on Loxodon Warrior, then you gain life equal to its power.
3/4
Diminiras, Hidden School of Thievery :2mana::symu::symb:
Legendary Enchantment
Shroud
:1mana::symu::symb: : Put a 1/1 blue and black Thief token with shadow into play with "Whenever this creature deals combat damage to a player, that player puts the top five cards of his or her library into his or her graveyard". Part of House Dimir, nobody could ever see the school, but everyone knew well enough that it existed.
Delay Fate :symr::symr:
Instant
When Delay Fate is put on the stack, if you didn't play it from your hand, you lose the game.
You gain 20 life.
Remove Delay Fate from the game with three time counters on it. It gains suspend. Some wizards that were hunted for their cruel deeds tried to evade their fate by manipulating the time streams. They didn't manage to evade their fate completely, however, they could delay it long enough to hunt down those who hunted them.
I'm not here until 23.6. - so should it be over before that and should I win, someone else may post a new task.
Asumed, Auriok Stonecaster :3mana::symw::symw:
Legendary Creature - Human Soldier Wizard
Prtoection from artifacts
:symw::symw:, : Tap target artifact. it doesn't untap during its controllers next untap stap.
Tap two untapped Soldiers you control: Destroy target tapped artifact.
3/5
Curse of Kamigawa :symu::symu:
Enchantment- Aura
Flash
Enchant Creature
Enchanted Creature is a Spirit in addition to it's other creature types.
:symu::symu: : Tap or untap target Spirit.
Raid the Fields
:symr::symg:
Sorcery
Put 3 artifact tokens named "Black Lotus" into play tapped with ":symtap:, sacrifice Black Lotus: Add 3 mana of any one color to your mana pool."
Raid the Fields deals 10 minus X damage to you, where X is the number of lands you control. Then sacrifice all lands you control.
Prismatic Bunny :symw::symu::symb::symr::symg:
Creature - Bunny
:symw::symu::symb::symr::symg: : Prismatic Bunny gets protection from the color of your choice until end of turn.
1/1
Selendor, Wurm of Assault 8:symg::symg::symg:
Legendary Creature - Wurm
Convoke
Whenever Selendor attacks, creatures you control get +2/+2 and gain trample until end of turn.
8/8
Ancient Force 5:symg::symg:
Creature - Force
Trample
: Regenerate Ancient Force.
Spend only mana produced by basic lands and/or green creatures to play Ancient Force.
11/8
Good ol' Classic Knight
Creature - Knight :symw::symw:
First Strike
:symw:: Good ol' Classic Knight gains protection from red or black until end of turn.
2/2
Actually, this seems perfectly balanced to me. Costs 1 Mana less than Paladin en-Vec , but you have to pay the difference every time you need the protection. It costs the same as Silver Knight or White Knight , has no protection, but can get both protections at a cost of one mana. So I won't change anything...
Next one:
Wall of Salvation :symw::symw:
Creature - Wall
Reach
Prevent all damage that would be dealt to Wall of Salvation.
Wall of Salvation may block any number of creatures.
Whenever Wall of Salvation blocks, you gain 10 life.
0/20
Spirit of Seven Winds 5:symu::symu:
Creature - Spirit
Flash
When Spirit of Seven Winds comes into play, return target permanent to its owners hand.
When Spirit of Seven Winds blocks, return it, all creatures its blocking and two other target permanents attacking player controls to their owners hands.
Spirit of Seven Winds may block an additional creature.
5/9
Quite a strange and broken card you made there, getting 16 life by sacrificing a beeble into a sliver! (by the way, what is a beeble? - I'm from switzerland, but is it even an english word?)
However
Essence of Strength 2:symg:
Creature - Elemental
Split Second
This creature comes into play with two +1/+1 counters on it.
Splice onto Creature :symg::symg: (As you play a Creature spell, you may reveal this card from your hand and pay its splice cost. If you do, add this cards text to the creature spell, so the creature spell has split second and the creature will come into play with two +1/+1 counters on it.) 0/0
Instant
Destroy target creature. Then, Overpower deals damage equal to that creatures converted mana cost divided as you choose among that creatures controller and creatures that player controls. Creatures that player controls can't block this turn.
Next:
Peaceful Colossus
Creature - Colossus
Peaceful Colossus can't attack or block.
11/11
Enchantment
:2mana::symw: : Put an Aura enchantment token into play with "Enchant creature you control" and "Enchanted creature gets +2/+2 and has flying".
When Griffin Stable leaves play, put two 2/2 Griffin creature tokens with flying into play.
(Yes, I like Griffin Guide )
Now, how about a non-Aura enchantment token?
However, here is the next card:
Robot Factory
Artifact
X , : Put a 0/0 construction creature token named Clockwork Robot into play with X +1/+1 counters on it and "Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat.".
XX : Put X +1/+1 counters on target construction.
Next:
Any noncreature enchantment token.
Instant
As an additional cost to play ~, remove any number of cards from the top of your library from the game.
Brainburn deals X damage to target creature or player, where X is the number of cards removed from the game this way. (I think you wanted it to work like this)
If Brainburn would deal damage to a player, that player may put half that many cards from the top of his or her library to his or her graveyard instead.
Next:
Loxodon Warrior :symg::symw:
Creature - Elephant
Trample, Lifelink
At the beginning of your upkeep, you may put a +1/+1 counter on Loxodon Warrior, then you gain life equal to its power.
3/4
Legendary Enchantment
Shroud
:1mana::symu::symb: : Put a 1/1 blue and black Thief token with shadow into play with "Whenever this creature deals combat damage to a player, that player puts the top five cards of his or her library into his or her graveyard".
Part of House Dimir, nobody could ever see the school, but everyone knew well enough that it existed.
Next:
2/2 white and blue creature tokens with flying.
Delay Fate :symr::symr:
Instant
When Delay Fate is put on the stack, if you didn't play it from your hand, you lose the game.
You gain 20 life.
Remove Delay Fate from the game with three time counters on it. It gains suspend.
Some wizards that were hunted for their cruel deeds tried to evade their fate by manipulating the time streams. They didn't manage to evade their fate completely, however, they could delay it long enough to hunt down those who hunted them.
I'm not here until 23.6. - so should it be over before that and should I win, someone else may post a new task.
Legendary Creature - Human Soldier Wizard
Prtoection from artifacts
:symw::symw:, : Tap target artifact. it doesn't untap during its controllers next untap stap.
Tap two untapped Soldiers you control: Destroy target tapped artifact.
3/5
Next: Withered Wretch
Curse of Kamigawa :symu::symu:Enchantment- Aura
Flash
Enchant Creature
Enchanted Creature is a Spirit in addition to it's other creature types.
:symu::symu: : Tap or untap target Spirit.
Raid the Fields
:symr::symg:
Sorcery
Put 3 artifact tokens named "Black Lotus" into play tapped with ":symtap:, sacrifice Black Lotus: Add 3 mana of any one color to your mana pool."
Raid the Fields deals 10 minus X damage to you, where X is the number of lands you control. Then sacrifice all lands you control.
Prismatic Bunny :symw::symu::symb::symr::symg:
Creature - Bunny
:symw::symu::symb::symr::symg: : Prismatic Bunny gets protection from the color of your choice until end of turn.
1/1
Legendary Creature - Wurm
Convoke
Whenever Selendor attacks, creatures you control get +2/+2 and gain trample until end of turn.
8/8
Next:
Deftblade Elite
Creature - Force
Trample
: Regenerate Ancient Force.
Spend only mana produced by basic lands and/or green creatures to play Ancient Force.
11/8
Next: :symw::symr:
Creature - Knight :symw::symw:
First Strike
:symw:: Good ol' Classic Knight gains protection from red or black until end of turn.
2/2
Actually, this seems perfectly balanced to me. Costs 1 Mana less than Paladin en-Vec , but you have to pay the difference every time you need the protection. It costs the same as Silver Knight or White Knight , has no protection, but can get both protections at a cost of one mana. So I won't change anything...
Next one:
Wall of Salvation :symw::symw:
Creature - Wall
Reach
Prevent all damage that would be dealt to Wall of Salvation.
Wall of Salvation may block any number of creatures.
Whenever Wall of Salvation blocks, you gain 10 life.
0/20
Creature - Spirit
Flash
When Spirit of Seven Winds comes into play, return target permanent to its owners hand.
When Spirit of Seven Winds blocks, return it, all creatures its blocking and two other target permanents attacking player controls to their owners hands.
Spirit of Seven Winds may block an additional creature.
5/9
Next:
Festering Goblin
However
Essence of Strength 2:symg:
Creature - Elemental
Split Second
This creature comes into play with two +1/+1 counters on it.
Splice onto Creature :symg::symg: (As you play a Creature spell, you may reveal this card from your hand and pay its splice cost. If you do, add this cards text to the creature spell, so the creature spell has split second and the creature will come into play with two +1/+1 counters on it.)
0/0
Did I get that right?
Next:
Flash, Aura Swap (look at Arcanum Wings )
Creature - Goblin Wizard
Haste, provoke
Whenever Fanatic Goblin Thinker deals combat damage, you may scry 2.
:symr::symr: : Fanatic Goblin Thinker gains double strike until end of turn.
2/1
Next:
Defender, Haste, Lifelink