Flutter, Duskwing Swarm

Flying, Trample
Remove X counters from this card and phase out
Flutter, Duskwing Swarm: X target creatures
are phased out until this card phases back in.
(Where X is the number of counters removed
from this card.)
Whenever any other creature phases in: If it's
controlled by you, it gains a +1/+1 counter,
otherwise, it gains a -1/-1 counter