(: Add or to your mana pool.)
Obsidian Retreat enters the battlefield tapped.
, , Sacrifice Obsidian Retreat: Put a -1/-1 counter on target creature.
, : Counter target spell unless its controller pays .
: Add 
or 
to your mana pool.), , Sacrifice Obsidian Retreat: Put a -1/-1 counter on target creature.
, : Counter target spell unless its controller pays .
