Fires of Invention is a rare Enchantment card from Throne of Eldraine (ELD), collector number 125. Current market price: $0.26 (foil $0.45), TCGplayer market prices via Scryfall.
You can cast spells only during your turn and you can cast no more than two spells each turn. You may cast spells with mana value less than or equal to the number of lands you control without paying their mana costs.