Senzu Beans

Senzu Beans enters with three counters on it.

{2}, Remove a counter from Senzu beans: Regenerate target creature you control. Then if Senzu Beans has no counters, sacrifice it, you gain
3 life.

"It's a Senzu Bean, magical. Just one will keep you full for at least ten days, but, uh, you have to eat it first." - Korin