Rootha, Mastering the Moment is a mythic Legendary Creature — Orc Sorcerer card from Secrets of Strixhaven Commander (SOC), collector number 8. Current market price: $0.86 (foil $0.36), TCGplayer market prices via Scryfall.
At the beginning of combat on your turn, if you've cast an instant or sorcery spell this turn, create an X/X blue and red Elemental creature token with flying and haste, where X is the greatest mana value among instant and sorcery spells you've cast this turn.