Tide Hydra

As an additional cost to cast Tide Hydra, remove
X target instants/sorceries from your graveyard
from the game.
Tide Hydra enters the battlefield with X +1/+1 counters on it.
Remove three +1/+1 counters from Tide Hydra:
Until the end of turn, you may cast target instant
or sorcery card from your graveyard.