Goblin Stronghold
Land-Swamp Mountain (Rare)

(Tap: Add B or R to your mana pool.)

When Goblin Stronghold enters the battlefield, sacrifice it unless you pay B.

1, Tap: Target land becomes a 2/2 red Ape creature until end of turn. It's still a land.

1BB, Tap, Sacrifice Goblin Stronghold: Target player discards a card.

Douglas Staples