Thicket Ruins
Land-Swamp Forest (Rare)

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

Thicket Ruins enters the battlefield tapped unless you pay 2.

2, Tap: Target land becomes a 3/3 green Elf Snake creature until end of turn. It's still a land.

Tap, Sacrifice a Swamp: Add BB to your mana pool.

Greg Grant West