Sphinx of Clear Skies is a mythic Creature — Sphinx card from Magic Online Promos (PRM), collector number 103400.
Flying, ward {2} Domain — Whenever this creature deals combat damage to a player, reveal the top X cards of your library, where X is the number of basic land types among lands you control. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard. (Piles can be empty.)