When Centaur Store enters the battlefield, sacrifice it unless you pay .
, : Add to your mana pool.
: Centaur Store becomes a 2/1 green and white Stag creature until end of turn. It's still a land.
., 
: Add 
to your mana pool., : Add to your mana pool.: Centaur Store becomes a 2/1 green and white Stag creature until end of turn. It's still a land.
