Twilight-works
Land (Rare)

When Twilight-works enters the battlefield, you lose 1 life unless you reveal a planeswalker card from your hand.

Tap: Add U or B to your mana pool.

Put Twilight-works on top of your library: Add 1 to your mana pool.

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

Douglas Moeller