Wither, the Deathfang

Flying, Toxic
{b}{b/g},{t}: Put a -1/-1 counter on Wither, the Deathfang. Then, if Wither, the Deathfang has
three or more -1/-1 counters on her, move a -1/-1 counter from Wither, the Deathfang to target creature.
{b}{b/g},{t}: Put a +1/+1 counter on target creature.