Arataki Itto, the last Oni

Haste, Trample

Arataki Itto enters the battlefield with X Cleave
counters on it.

whenever Arataki Itto attacks, you may remove a
Cleave counter from it. if you do, Arataki Itto gains
first strike and gets +X/+X until end of turn, where
X is the number of Cleave counters on Arataki Itto.