Horde Matriarch

Mutate {2}{b/g} (You may play this card for its Mutate
cost, and when you do, place it on over or under a
Creature card. The card on top has the abilities and effects of the card underneath.)
Spawn {p/g}{p/g} -or- {p/b}{p/b} (Create two 3/1 Sithspawn
Hornet Tokens with Flying, Acid Spray {t}{b}{b}, and Stinger. Tokens created with this ability are destroyed
at the end of your opponent's turn.)