Golma, Bloodhungry

Eminence-Whenever another Hydra enters the battlefield under your control, if Golma, Bloodhungry is in the command zone or on the battlefield, you may pay {x}. If you do, that Hydra enters with X +1/+1 counters on it. Golma, Bloodhungry enters the battlefield with a number
of +1/+1 counters on it equal to the amount
of mana spent to cast it.
Golma, Bloodhungry attacks each combat if able.
Other Hydra creatures you control have Menace.