Vaevictis Asmadi, the Dire is a mythic Legendary Creature — Elder Dragon card from Secret Lair Drop (SLD), collector number 2239.
Flying Whenever Vaevictis Asmadi attacks, for each player, choose target permanent that player controls. Those players sacrifice those permanents. Each player who sacrificed a permanent this way reveals the top card of their library, then puts it onto the battlefield if it's a permanent card.