Korlessa, Scale Singer 
Legendary Creature — Dragon Bard
You may look at the top card of your library any time. You may cast Dragon spells from the top of your library.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL