(: Add or to your mana pool.)
Abandoned Bosk enters the battlefield tapped unless you control one or more creatures.
: Abandoned Bosk becomes a 2/1 white and black Cleric creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Abandoned Bosk becomes a 2/1 white and black Cleric creature until end of turn. It's still a land.
