Pelavor Troll

Painborn (Each 1 life you pay while casting this spell pays for {1}. This creature enters the battlefield with a -1/-1 counter on it for each 1 life
paid this way.)
Whenever another creature with counters on it enters the battlefield under your control, you
may double or remove half the number of counters on target creature, rounded up.
Volkir feigns indifference towards this species.