When Centaur Steppe enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
Put Centaur Steppe on top of your library: Add to your mana pool.
, Sacrifice Centaur Steppe: Add to your mana pool.
.
: Add or 
to your mana pool.
to your mana pool. , Sacrifice Centaur Steppe: Add 
to your mana pool.
