Obsidian Turf
Land-Swamp Forest (Rare)

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

When Obsidian Turf enters the battlefield, sacrifice it unless you pay 1 life.

2B, Tap: Target player loses 1 life.

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

Allan Walker