Talaketh, Wood’s Gravebringer

Eminence - Whenever a creature enters the battlefield under your control, if Talaketh, Wood’s Gravebringer is in the command zone or on the battlefield, put a -1/-1 counter on it.

Unleash, wither, indestructible

You may only cast Talaketh, Wood’s Gravebringer if three or more creatures you control have -1/-1 counters on them.