Polymerization

When you cast this spell, reveal a Fusion creature
you own from outside the game.
Exile the listed Tribute cards on the selected
Fusion creature (at least 1 of those cards must be on
the battlefield under your control, the other(s) may be revealed and then exiled from your hand). Place the
Fusion creature on the battlefield under your
control.
If the Fusion creature should die, put it in your graveyard (treat it as a normal creature). If it
would be sent to your library, exile it ins