Vault Oasis
Land (Rare)

Vault Oasis enters the battlefield tapped unless you sacrifice a Green permanent.

Tap: Add B to your mana pool. Activate this ability only if you control a Swamp.

Tap: Add G to your mana pool. Activate this ability only if you control a Forest.

G, Sacrifice Vault Oasis: Target creature gets +2/+2 until end of turn.

Steve Schuler