Exodus Regent

Exodus Regent enters the battlefield with X +1/+1 counters and X annihilation counters on it, where X is the number of creatures on the battlefield.
Flying, vigilance, deathtouch, trample
{t}, remove a +1/+1 counter and an annihilation counter from Exodus Regent: exile target creature.
Whenever Exodus Regent becomes the target of a spell you have cast or control or effect originating from a spell you have cast or control, put a +1/+1 counter and an annihilation counter on Exodus Regent.