(: Add or to your mana pool.)
Obsidian Fields enters the battlefield tapped.
, , Sacrifice Obsidian Fields: Put a -1/-1 counter on target creature.
, : Target creature gains vigilance until end of turn.
: Add 
or 
to your mana pool.), , Sacrifice Obsidian Fields: Put a -1/-1 counter on target creature.
, : Target creature gains vigilance until end of turn.
