Snake Dog

Snake Dog enters the battle with X 1/1 counters on it, where X is the amount of creatures and plainswalkers you control.
When a creature enters the battlefield under your control, you may remove a 1/1 counter from Snake Dog, if you do, draw a card.
{g/w}, Remove three 1/1 counter from Snake Dog,
target creature gains +2/+2, vigilance and trample.