Magmatic Channeler is a rare Creature — Human Wizard card from Jumpstart 2022 (J22), collector number 571. Current market price: $0.31, TCGplayer market prices via Scryfall.
As long as there are four or more instant and/or sorcery cards in your graveyard, this creature gets +3/+1. {T}, Discard a card: Exile the top two cards of your library, then choose one of them. You may play that card this turn.