Toadally Awesome

Mutate {7}{u}{b}{g}
Exile a creature underneath this creature: Search your library for a frog creature. You may cast that card without paying its mana cost.

When an opponent casts an instant or sorcery: You may discard a frog creature. If you do, Counter target spell. If that spell would be sent to the graveyard, instead exile it with a croak counter on it. You may cast that spell until the end of your next turn.
When Toadally Awesome is sent to the graveyard, you may add a frog creature from your