When Centaur Depths enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
Put Centaur Depths on top of your library: Add to your mana pool.
, , Sacrifice Centaur Depths: Target creature gets -2/-2 until end of turn.
.
: Add or 
to your mana pool.
to your mana pool. , , Sacrifice Centaur Depths: Target creature gets -2/-2 until end of turn.
