Fire Magic has the new Tiered ability, which lets players spend different amounts of mana to emulate different tiers of spells, such as Fire, Fira, and Firaga
Once this happens they begin casting a series of spells to eventually draw, cast, or ramp enough to win the game
That means cards could use the exert ability again if you can pay any ink cost it might have
If that creature is no longer attacking, it refers to the player it was last attacking or the controller of the planeswalker it was last attacking
Its a cool card, but its quite pricey, and is only at its best with five-color tribes like Dragons and Elementals
Rise of the Floodborn adds 204 new cards plus more Enchanted variants for a total of 216 cards