Chrysalide Branchlurker

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.)
Ambush, Bloodlust, Stealth
Acid Spray {t}{g}{g}{g} (Target a card on the
opponent's field and place -1/-1 counters on it equal to
this card's attack value.)