Hei Bai, Spirit of Balance
From Avatar: The Last Airbender set
Hei Bai, Spirit of Balance
Legendary Creature — Bear Spirit
3/3
Whenever Hei Bai enters or attacks, you may sacrifice another creature or artifact. If you do, put two +1/+1 counters on Hei Bai.
When Hei Bai leaves the battlefield, put its counters on target creature you control.