Woods Full of Angry Trees

Flash
Exile Target attacking creature, it remains exiles
so long as Forest Full or Angry Trees is in play.
When Forest Full or Angry Trees enters play,
put X tree counters on it. Remove a tree counter
during your upkeep. Destroy it when it has no
tree counters.
Barlak took his axe to the woods. Seven years
later he came out regretting that decision."