Mossy Crocodile

When Mossy Crocodile enters the battlefield,
put a -1/-1 counter on each creature.
Creatures you control with -1/-1 counters on
them have hexproof.
{b/g}{g/u}{t}: Target creature with a -1/-1
counter on it gets Toxic X where X is equal
to the number of -1/-1 counters on it.