Aenwyn, Eyes of the Falcon

Whenever another Elf enters the battlefield
under your control, put a +1/+1 counter on
Aenwyn, Eyes of the Falcon.
Whenever Aenwyn attacks, you may remove all
+1/+1 counters from her. If you do, other
attacking Elves you control get +1/+1 until end
of turn for each counter removed this way.
"They want our forests and rivers? Let us give
them a forest of arrows and a river of blood."