Planetarium of Wan Shi Tong

Set: Avatar: The Last Airbender
Type: Legendary Artifact
Cost:
Color: Colorless

, : Scry 2.
Whenever you scry or surveil, look at the top card of your library. You may cast that card without paying its mana cost. Do this only once each turn. (Look at the card after you scry or surveil.)

It charts the movements of heavenly bodies, forecasting the fates of nations.