Living Conundrum 
Creature — Elemental
Hexproof If you would draw a card while your library has no cards in it, skip that draw instead. As long as there are no cards in your library, this creature has base power and toughness 10/10 and has flying and vigilance.
Legality
standardLEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL