Raptor's Camp

Arsenal(You may cast this card from your sideboard.)
Life 2 - Whenever this card enters the battlefield
or transforms into Raptor's Camp, put two life
counters on it. Tap a legendary creature you
control: Remove X life counters from this card,
where X is the amount of the power plus the
number of AP counters on that creature. When
the last life counter is removed from this
card, transform it. Any player can activate this
ability as a sorcery.