Rionya, Fire Dancer is a rare Legendary Creature — Human Wizard card from Foundations Jumpstart (J25), collector number 75. Current market price: $3.20, TCGplayer market prices via Scryfall.
At the beginning of combat on your turn, create X tokens that are copies of another target creature you control, where X is one plus the number of instant and sorcery spells you've cast this turn. They gain haste. Exile them at the beginning of the next end step.