if you control two or more other lands, den of the bugbear enters the battlefield tapped.
t: add r.
3r: 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.
Flumphs siphon thoughts and energy from evil aberrations, and are often eager to share the dark knowledge they obtain with friendly adventurers.