Abarai Renji, Lt. of the 6th

Haste, menace
{3}{r}{r}: Monstrosity 2. (If this creature isn't monstrous, put two +1/+1 counters on it and it
becomes monstrous.)
When Renji attacks, if he is monstrous, create a
4/4 colorless Snake artifact creature token tapped
and attacking. Exile that token at end of combat.