Mystic Eel

{2}{g}{u}: Adapt 2. (If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.)
{1}{u}, {t}: Remove a +1/+1 counter from Mystic Eel: Tap target creature an opponent controls.
The Simic tamper with all kinds of mutated animalia, from hulking abominations to subtle genetic alterations.