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Rules Text

If you control two or more other lands, Den of the Bugbear enters the battlefield tapped.

"Tap": Add "Red".

"3""Red": Until end of turn, Den of the Bugbear becomes a 3/2 red Goblin creature with "Whenever this creature attacks, create a 1/1 red Goblin creature token that’s tapped and attacking." It’s still a land.