(: Add or to your mana pool.)
Dragonskull Basin enters the battlefield tapped.
, , Sacrifice Dragonskull Basin: Put a -1/-1 counter on target creature.
, : Put a +1/+1 counter on target creature.
: Add 
or 
to your mana pool.), , Sacrifice Dragonskull Basin: Put a -1/-1 counter on target creature.
, : Put a +1/+1 counter on target creature.
