This sounds like fun and I don't see a similar game, so here it is.
The Rule:
Make up a card that has synergy with the last card posted.
It doesn't have to be incredibly obvious, as long as the two cards combo in some way. Try to make it interesting and have fun, eh?
Bryndwood Druid
Creature - Human Druid
:symtap:, Remove a +1/+1 counter from a creature you control: search your library for a basic land and put that card into play.
Remove a +1/+1 counter from a creature you control: untap Bryndwood Druid.
1/1
Guildmage Zealot :2mana::symu::symu:
Creature - Human Wizard
Sacrifice Guildmage Zealot: Put a copy of target blue Instant on the stack. You may choose new targets for that copy.
1/3
Eternal Dispair
R, Enchantment, :3mana::symb::symb:
At the beginning of your upkeep, destroy each creature with toughness 3 or less, they can't be regenerated. You lose 1 life for each creature destroyed this way.
Lifeforce Spirit :6mana::symw::symw::symw::symw:
Creature-Spirit
~'s power is equal to your life total, and it's toughness to your life total plus one.
When ~ comes into play, you gain five life.
Whenevr you gain life after ~ comes into play, ~ gets +X/+X until end of turn, where X is the amount of life gained.
*/*+1
Elite Warplanner :1mana::symr::symr:
Creature - Human Warrior
Sacrifice Elite Warplanner: Up to two target creatures can't block this turn.
When Elite Warplanner is put into a graveyard from play, target creature gains first strike until end of turn.
3/1
Relentless Pillage :1mana::symr::symr:
Sorcery
Until end of turn, whenever creatures you control deals combat damage, your opponent sacrifices all creatures that did not block this turn. Surrender now, or don't... it doesn't matter.
Nagato War Hounds
C, Creature - Hound, :3mana::symr:
No more than one creature may block each turn. There seems to always be one fool who doesn't run from these things.
- Nagato WarChief
4/2
Peculiar Kami :3mana::symu:
Soulshift 3, Soulshift 3
Whenever you would return a creature from your graveyard to your hand, put it into play instead.
2/2
The Rule:
Make up a card that has synergy with the last card posted.
It doesn't have to be incredibly obvious, as long as the two cards combo in some way. Try to make it interesting and have fun, eh?
Example (with real cards):
One person posts Scion of Darkness.
Next person posts Dark Supplicant.
Next: Rotlung Reanimator.
Next: Goblin Bombardment
I'll start with this:
Bryndwood Druid
Creature - Human Druid
:symtap:, Remove a +1/+1 counter from a creature you control: search your library for a basic land and put that card into play.
Remove a +1/+1 counter from a creature you control: untap Bryndwood Druid.
1/1
Power to the Beasts 3GG
Sorcery
Put 2 +1/+1 counters on each green creature you control.
Sorcery
Target creature gets X +1/+1 counters, where X is the number of +1/+1 counters another target creature has on it.
Artifact
(tap) move as many +1/+1 counters from creatures you control to other creatures you control
Banner and avatar by Maxeel at Midnight GFX
Instant
Untap target artifact.
Creature - Human Wizard
Sacrifice Guildmage Zealot: Put a copy of target blue Instant on the stack. You may choose new targets for that copy.
1/3
Instant
Any creature sacrificed this turn comes back into play tapped. You can't use it's abilities this turn.
Not worded right, I know.
R, Enchantment, :3mana::symw:
Sacrifice a creature you control: You gain life equal to that creature's toughness.
No longer staff here.
R, Enchantment, :3mana::symb::symb:
At the beginning of your upkeep, destroy each creature with toughness 3 or less, they can't be regenerated. You lose 1 life for each creature destroyed this way.
No longer staff here.
Creature-Spirit
~'s power is equal to your life total, and it's toughness to your life total plus one.
When ~ comes into play, you gain five life.
Whenevr you gain life after ~ comes into play, ~ gets +X/+X until end of turn, where X is the amount of life gained.
*/*+1
Creature - cleric
Creature spells cost WWWW less to play
0/5
Shadowmoor's Infinite combos
Enchantment
Whenever you draw a card other than your first card in a turn, put a +1/+1 counter on target creature.
Sorcery
Draw cards equal to the power of target creature you control.
GG1
Instant
Target creature gains +X/+0 until end of turn, where X is the number of creatures you control
Instant
Target player loses X life, where X is target creature's power.
Instant
As an additional cost to play Pay the Price, sacrfice a creature.
Target creature gets +5/+0 until end of turn.
Creature - Human Warrior
Sacrifice Elite Warplanner: Up to two target creatures can't block this turn.
When Elite Warplanner is put into a graveyard from play, target creature gains first strike until end of turn.
3/1
Sorcery
Until end of turn, whenever creatures you control deals combat damage, your opponent sacrifices all creatures that did not block this turn.
Surrender now, or don't... it doesn't matter.
C, Creature - Hound, :3mana::symr:
No more than one creature may block each turn.
There seems to always be one fool who doesn't run from these things.
- Nagato WarChief
4/2
No longer staff here.
Instant
All attacking creatures get +3/+0 and swampwalk.
BB1
1/1
Sacrifice Kami of the Marsh: Target land becomes a Swamp until end of turn
Soulshift 2
Soulshift 3, Soulshift 3
Whenever you would return a creature from your graveyard to your hand, put it into play instead.
2/2
Creature -- Spirit
Sacrifice Flame-Tail Kami: Flame-Tail Kami deals 2 damage to target creature or player.
2/1
Creature - Orgg
Whenever Furious Orgg is dealt damage, it deals double that damage to target creature or player.
5/3
Artifact creature - wall
defender (this creature cannot attack)
Whenever punchbag is dealt damage put a +1/+1 counter on target creature
1/4
Shadowmoor's Infinite combos