Dwarven Fortress

If Dwarven Fortress would enter, sacrifice a Mountain instead. If you do, put Dwarven Fortress onto the battlefield. If you don’t, put it into its owner’s graveyard.

{t}: Add {r}. Spend this mana only to cast a Dwarf creature or artifact spell.

{t}, {1}{r}: create a 1/1 red Dwarf creature token. Activate only if you control a Dwarf.