Fireball (CE) [Collectors’ Edition] Standard some wizards are finding that

some wizards are finding that they have a little too much spell left at the end of their mana

Set: Saviors of Kamigawa Type: Legendary Creature — Human Shaman Rarity: Rare Cost: {2}{G} Whenever you cast a legendary spell

Set: Amonkhet Invocations Type: Enchantment Mythic Cost: {7}{U}{U}{U} You may cast spells from your hand without paying their mana costs

but I didn't expect it from the building itself

Fireball (CE) [Collectors’ Edition] Standard some wizards are finding thatSet: Collectors Edition Type: Sorcery Common Cost: {X}{R} This spell costs {1} more to cast for each target beyond the first. Fireball deals X damage divided evenly, rounded down, among any number of targets.