MTG

Nonwhite creatures get -1/-1 until end of turn.

Water Wurm gets +0/+1 as long as an opponent controls an Island.

Whenever Marsh Viper deals damage to a player, that player gets two poison counters. (A player with ten or more poison counters loses the game.)

{T}, Sacrifice another Orc or Goblin: Other Orc creatures get +1/+1 until end of turn.

As Psychic Allergy enters the battlefield, choose a color. At the beginning of each opponent's upkeep, Psychic Allergy deals X damage to that playe...

When Electric Eel enters the battlefield, it deals 1 damage to you. {R}{R}: Electric Eel gets +2/+0 until end of turn and deals 1 damage to you.

Enchant land As long as enchanted land is a basic Mountain, Goblin creatures get +1/+0. When Goblin Shrine leaves the battlefield, it deals 1 damag...

{G}, {T}, Sacrifice Scavenger Folk: Destroy target artifact.

First strike

Whenever Murk Dwellers attacks and isn't blocked, it gets +2/+0 until end of combat.

{T}, Sacrifice Living Armor: Put X +0/+1 counters on target creature, where X is that creature's converted mana cost.

{T}: Destroy target Aura attached to a creature you control.

As Frankenstein's Monster enters the battlefield, exile X creature cards from your graveyard. If you can't, put Frankenstein's Monster into its own...

Trample Goblin Rock Sled doesn't untap during your untap step if it attacked during your last turn. Goblin Rock Sled can't attack unless defending ...

Flying {U}{U}{U}: Regenerate Ghost Ship.

{T}: Witch Hunter deals 1 damage to target player or planeswalker. {1}{W}{W}, {T}: Return target creature an opponent controls to its owner's hand.

Protection from red; banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatur...

Green creatures have forestwalk. (They can't be blocked as long as defending player controls a Forest.)

{U}: Until end of turn, if you tap a land you control for mana, it produces {U} instead of any other type.

All creatures get -2/-0 until end of turn.

First strike; banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with...

You and target opponent each flip a coin. Mana Clash deals 1 damage to each player whose coin comes up tails. Repeat this process until both player...

Tap all blue creatures.

{G}{G}, {T}: Destroy target Aura attached to a land.