Niv-Mizzet Reborn

Niv-Mizzet Reborn {W}{U}{B}{R}{G}

Legendary Creature - Dragon Avatar | Power/Toughness: 6 / 6 (CMC 5)
When Niv-Mizzet Reborn enters the battlefield, reveal the top ten cards of your library. For each color pair, choose a card that's exactly those colors from among them. Put the chosen cards into your hand and the rest on the bottom of your library in a random order.