(: Add or to your mana pool.)
Graven Cavern enters the battlefield tapped unless you pay .
, : Target red creature gains haste until end of turn.
, , Sacrifice Graven Cavern: Target player discards a card.
: Add 
or 
to your mana pool.).
, : Target red creature gains haste until end of turn., , Sacrifice Graven Cavern: Target player discards a card.
