Flamekin Herald is a rare Creature — Elemental Wizard card from Commander Legends (CMR), collector number 665. Current market price: $0.93 (foil $2.04), TCGplayer market prices via Scryfall.
Commander spells you cast have cascade. (Whenever you cast a commander, exile cards from the top of your library until you exile a nonland card with lesser mana value. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)