(: Add or to your mana pool.)
When Vault Coliseum enters the battlefield, sacrifice it unless you pay 2 life.
: Vault Coliseum becomes a 2/1 black and blue Rogue Rat creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Vault Coliseum becomes a 2/1 black and blue Rogue Rat creature until end of turn. It's still a land.
