Leechridden Key
Land (Rare)

When Leechridden Key enters the battlefield, return a land you control to its owner's hand.

Tap: Add U or B to your mana pool.

Tap: Add 2 to your mana pool. Put Leechridden Key on top of your library.

1U: Leechridden Key becomes a 1/1 blue and black Skeleton creature with flying until end of turn. It's still a land.

John Argyle