Whenever Centaur Keep becomes tapped, it deals 1 damage to you.
: Add or to your mana pool.
Put Centaur Keep on top of your library: Add to your mana pool.
: Return Centaur Keep to its owner's hand.
: Add 
or 
to your mana pool.
to your mana pool. : Return Centaur Keep to its owner's hand.
