Boomerang

Return target permanent to its owner's hand.

Forced Fruition

Whenever an opponent casts a spell, that player draws seven cards.

Cabal Ritual

Add {B}{B}{B}.
Threshold — Add {B}{B}{B}{B}{B} instead if seven or more cards are in your graveyard.

Ritual of Soot

Destroy all creatures with mana value 3 or less.

Runeflare Trap

If an opponent drew three or more cards this turn, you may pay {R} rather than pay this spell's mana cost.
Runeflare Trap deals damage to target player equal to the number of cards in that player's hand.