Chaos Channeler 
Creature — Human Shaman
Wild Magic Surge — Whenever this creature attacks, roll a d20. 1—9 | Exile the top card of your library. You may play it this turn. 10—19 | Exile the top two cards of your library. You may play them this turn. 20 | Exile the top three cards of your library. You may play them this turn.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL