Obsidian Hollows enters the battlefield tapped.
: Add to your mana pool. Return Obsidian Hollows to its owner's hand.
, , Sacrifice Obsidian Hollows: Target creature gets -2/-2 until end of turn.
: Add 
to your mana pool. Return Obsidian Hollows to its owner's hand., , Sacrifice Obsidian Hollows: Target creature gets -2/-2 until end of turn.
