Obsidian Academy enters the battlefield tapped unless you control two or more creatures.
: Add to your mana pool.
: Add or to your mana pool. Each opponent gains 1 life.
, , Sacrifice Obsidian Academy: Target creature gets -2/-2 until end of turn.
: Add 
to your mana pool.: Add 
or 
to your mana pool. Each opponent gains 1 life., , Sacrifice Obsidian Academy: Target creature gets -2/-2 until end of turn.
