Eye of the Storm is a rare Enchantment card from Ravnica: City of Guilds (RAV), collector number 48. Current market price: $1.32 (foil $39.99), TCGplayer market prices via Scryfall.
Whenever a player casts an instant or sorcery card, exile it. Then that player copies each instant or sorcery card exiled with this enchantment. For each copy, the player may cast the copy without paying its mana cost.