The Lunar Whale 
Legendary Artifact — Vehicle
Flying You may look at the top card of your library any time. As long as The Lunar Whale attacked this turn, you may play the top card of your library. Crew 1
Legality
standardLEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL