Golgari Power Sludgex2BBG
Sorcery
Creatures you control get +x/+0 until end of turn. Creatures you don't control get -0/-x until end of turn. If X is 5 or more, double it instead.
Lava Rock Elemental :symr::symr::symr::symr:
Creature - Elemental
Persist
Sacrifice Lava Rock Elemental: Lava Rock Elemental deals 2 damage to target creature or player.
2/2
Zombie Resurrector :sym2b::sym2b::sym2b:
Creature - Zombie Cleric
Discard five cards: Return each creature card put into your graveyard from anywhere this turn to the battlefield.
1/1
Mimeoarmy :1mana::symb::symu::symg:
Sorcery
Put a 2/2 black Zombie creature token with intimidate, a 2/1 blue Faerie creature token with flying, and 1/2 green Spider creature token with reach onto the battlefield.
Plague of Skithiryx :9mana::symb::symb:
Sorcery
Each opponent gets nine poison counters.
At the beginning of your upkeep, if Plague of Skithiryx is in your graveyard, you may pay 3BB. If you do, each opponent gets a poison counter.
Dream Tax :xmana::sym2w::sym2u:
Enchantment
Dream Tax enters the battlefield with X time counters.
Spells cost X more to cast, where X is the number of time counters on Dream Tax.
Vanishing
Creature - Goblin
Haste
T: Skirk Bazooka Patrol deals 9 damage to target creature or player.
1/1
Next: 7RRRR
Sorcery
Creatures you control get +x/+0 until end of turn. Creatures you don't control get -0/-x until end of turn. If X is 5 or more, double it instead.
Next: X2RRW
Creature - Soldier
Double strike
0/1
Next: U
Creature - Elemental
Persist
Sacrifice Lava Rock Elemental: Lava Rock Elemental deals 2 damage to target creature or player.
2/2
Next: WWWW
Creature - Elemental Beast
Trample
At the beginning of your upkeep, each opponent draws seven cards.
9/9
Next: xWUBRG
Instant
Exile target spell. Its controller gains 3 life and you lose 3 life.
Next: :sympu::sympu:
Bonus: Make it a counterspell. Seems challanging to balance.
Enchantment
Creatures you control that are green and only green get +7+7.
Next: 13
Tribal Sorcery - Eldrazi
Target player sacrifices a colored permanent with CMC X and a colored permanent with CMC Y.
Next: UU
Creature - Zombie Cleric
Discard five cards: Return each creature card put into your graveyard from anywhere this turn to the battlefield.
1/1
Next: xUUGG
Sorcery
Put a 2/2 black Zombie creature token with intimidate, a 2/1 blue Faerie creature token with flying, and 1/2 green Spider creature token with reach onto the battlefield.
Next: R
Extra credit: kicker of WUBG
Sorcery
Each opponent gets nine poison counters.
At the beginning of your upkeep, if Plague of Skithiryx is in your graveyard, you may pay 3BB. If you do, each opponent gets a poison counter.
Next: xWU or xBW or xWR or xGW
Instant
For each blocking creature, exile target permanent.
Next: 2UBRR
Enchantment
Dream Tax enters the battlefield with X time counters.
Spells cost X more to cast, where X is the number of time counters on Dream Tax.
Vanishing
Next: :3mana::dontoverusethis::dontoverusethis:
can be paid with 3 or by sacrificing a permanent.
Sorcery
Destroy each creature with X power, then destroy each creature with Y toughness.
Next: UUUUUU
Artifact creature - Warrior
Haste, Frenzy 3
1/1
If you don't recognize Frenzy, it was only printed on one card: Frenzy Sliver.
Next: :sym2u::sym2u::sym2g::sym2g: or :sympu::sympu::sympg::sympg: