Counterspell

Snap

Return target creature to its owner's hand. Untap up to two lands.

Crypt Rats

{X}: This creature deals X damage to each creature and each player. Spend only black mana on X.

Spell Pierce

Counter target noncreature spell unless its controller pays {2}.

Cast Down

Drown in Sorrow

All creatures get -2/-2 until end of turn. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Chainer's Edict

Target player sacrifices a creature of their choice.
Flashback {5}{B}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)