Carnage, Vile Symbiote

Carnage, Vile Symbiote's power is equal to the number of creatures in play with Symbiote counters on them.
{t},{b}: Put a Symbiote counter onto a target creature. It becomes an Ooze as well as its other creature types.
{r}{r}: Goad a creature target opponent controls with a symbiote counter on it until end of turn. Put a +1/+1 counter on it. It gains haste until end of turn.
Whenever a creature with a Symbiote counter on it attacks or dies, you may draw a card.