Rushia, Vexxed Necromancer

Rushia gets +1/+0 for every two Mountains on
the battlefield.
Whenever a Plains becomes tapped, put a rage
counter on Rushia. When there are five or more
rage counters on Rushia, remove all rage
counters from it and it deals damage to all other
creatures equal to its power, then you may put a
creature card that left the battlefield this turn
from your graveyard to your hand.