(: Add or to your mana pool.)
When Hollow Furnace enters the battlefield, you lose 2 life unless you reveal an artifact card from your hand.
: Hollow Furnace becomes a 2/1 black and red Rat creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Hollow Furnace becomes a 2/1 black and red Rat creature until end of turn. It's still a land.
