Septupling the mana produced by everyones lands seems very charitable, until Yurlok of Scorch Thrash shows up
PRODUCT HIGHLIGHTS Uncommon sorcery card from Magic: The Gathering's Dark Ascension set
It might be a specialized class, but as one of the strongest Izzet enchantments, it would fit really well in a spellslinger deck like Veyran, Voice of Duality
The obvious play is casting it during your opponent's combat to survive a lethal combat threat and blank the rest of their turn, but you can also cast it during your own combat to blank an overloaded Cyclonic Rift and exile it off the stack
The base of the card isnt especially good, but once you get up to the second level, youve paid 4 mana for an Anthem and a tax on your opponents spells during your turn, and I think that would probably be a card I always played, and this has the upside of letting you pay that 4 mana in installments, as well as the fact that it can go to level three, at which point it will make one of your creatures into a really frightening attacker every turn