Equilibrium

Whenever you cast a creature spell, you may pay {1}. If you do, return target creature to its owner's hand.

Onslaught

Whenever you cast a creature spell, tap target creature.

Whenever you cast a creature spell, you may pay {1}. If you do, draw a card, then discard a card.

Whenever you cast a creature spell, Furious Assault deals 1 damage to target player or planeswalker.

Whenever you cast a creature spell with mana value 6 or greater, put three +1/+1 counters on Kurgadon.

Whenever you cast a creature spell this turn, draw a card.