Ashiok, Trespasser of Nyx

: At the beginning of your upkeep, if your devotion to all colors is five or greater, you may pay WUBRG. If you do, transform Ashiok, Tres. of Nyx
+1: Exile the top card of each player's library. Until the end of your turn, you may play those cards.
-1: Create two 1/1 blue and black Nightmare enchantment creature tokens. Ashiok, Tres. of Nyx can be your commander.