Stifle is mediocre here since Elves' key payoffs like Green Sun's Zenith and Natural Order are sorcery-speed searches, not activated/triggered abilities, so it comes out. Wrath of the Skies is excellent against their wide mana-dork and token board, letting us pay energy to wipe their Llanowar Elves, Fyndhorn Elves, and other small creatures while leaving our own higher-cost permanents untouched. Prismatic Ending can exile a mana dork or any other cheap nonland permanent threatening to go wide, such as Badgermole Cub or Collector Ouphe. With only white and blue mana it tops out at mana value 2. It can't target lands, so Gaea's Cradle is off the table for it. Keep Wasteland in to attack Gaea's Cradle and their otherwise light manabase.