Breeding Wreckage
Land (Rare)

Breeding Wreckage enters the battlefield tapped.

Tap: Add B or G to your mana pool.

Sacrifice Breeding Wreckage: Add B or G to your mana pool.

BG: Breeding Wreckage becomes a 2/1 green and black Elf Bear creature until end of turn. It's still a land.

John Moeller