(: Add or to your mana pool.)
Brush-Tomb enters the battlefield tapped.
: Brush-Tomb becomes a 2/1 green and black Squirrel creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Brush-Tomb becomes a 2/1 green and black Squirrel creature until end of turn. It's still a land.
