Leechridden Vents
Artifact Land (Rare)

(Leechridden Vents isn't a spell.)

Leechridden Vents enters the battlefield tapped.

Leechridden Vents is indestructible. (Destroy effects and lethal damage don't destroy it.)

Tap: Add U or B to your mana pool.

Sacrifice Leechridden Vents: Add U or B to your mana pool.

Chippy Guay