(: Add or to your mana pool.)
Grass-Cave enters the battlefield tapped unless you pay 1 life.
: Grass-Cave becomes a 2/1 green and red Squirrel creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Grass-Cave becomes a 2/1 green and red Squirrel creature until end of turn. It's still a land.
