Hanging Tree

Defender
{2}{w}: Exile a creature blocked by Hanging Tree.
{2}{b}: Hanking Tree base power becomes 7 and
it loses defender. Other players each lose 13.
You gain 13 life. Activate this ability only if you
have exiled creatures with a cumulative owner
of 13 or more with a HangingTree, and have not
used this ability already.
It rewarded those who fed it lives.