(: Add or to your mana pool.)
When Caves Park enters the battlefield, sacrifice it unless you pay 1 life.
, , Sacrifice Caves Park: Put a -1/-1 counter on target creature.
, : You gain 1 life.
: Add 
or 
to your mana pool.), , Sacrifice Caves Park: Put a -1/-1 counter on target creature.
, : You gain 1 life.
