Chaos Channeler is a uncommon Creature — Human Shaman card from The List (PLST), collector number AFR-136. Current market price: $0.15, TCGplayer market prices via Scryfall.
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.