Feed the Swarm [Starter Commander Decks] SPA Contrariar Set: Mystery Booster Type: Instant

Set: Mystery Booster Type: Instant Rarity: Common Cost: {1}{W} Exile target creature you control

And it's definitely something to worry about

Whenever a permanent you control becomes the target of a spell or ability an opponent controls

Sacrifice a creature: Target player discards a card

Set: World Championship Decks 2003 Type: Creature — Goblin Rarity: Common Cost: {R} Sacrifice a Goblin: Add {R}

Feed the Swarm [Starter Commander Decks] SPA Contrariar Set: Mystery Booster Type: InstantSet: Starter Commander Decks Type: Sorcery Rarity: Common Cost: {1}{B} Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value. "On vile wings and bloody wind, the swarm will rise." @ Skyclave inscription