Graven Stadium enters the battlefield tapped unless you control one or more creatures.
: Add to your mana pool. Return Graven Stadium to its owner's hand.
, Sacrifice Graven Stadium: Graven Stadium deals 1 damage to target creature or player.
: Add 
to your mana pool. Return Graven Stadium to its owner's hand., Sacrifice Graven Stadium: Graven Stadium deals 1 damage to target creature or player.
