(: Add or to your mana pool.)
Caves Oasis enters the battlefield tapped unless you control two or more creatures.
, , Sacrifice Caves Oasis: Put a -1/-1 counter on target creature.
, : Put a +1/+1 counter on target creature.
: Add 
or 
to your mana pool.), , Sacrifice Caves Oasis: Put a -1/-1 counter on target creature.
, : Put a +1/+1 counter on target creature.
