Trasta, Swallower of Seas

Trample
Whenever Trasta, Swallower of Seas attacks, each player puts the top 4 cards of their library into
their graveyard.
Exile X cards from your graveyard: You may cast target card with converted mana cost X from
your graveyard this turn. If you exile a land card
this way, create a 1/1 blue fish creature token.