If you don't have Yula use Emmigosa. Worked 1st try but small RNG. Emmigosa X-2-X Nether Faerie Dragon - 2-2-X (its recommended that it be 282+ speed but 260 can work) Nexsus Whelping - X-2-2 (305 speed)
1. Emingosa - wild magic and emingosa dies 2. NFD - Arcane blast X 4 then life exchange and arcane blast till dead , you should die from the canon when you have very little health left in round 9 (if no cannon and you died then start again) 3. Nexus Whelping - Arcane Storm, mana surge, arcane storm, mana surge 1st hit and it dies
Note: if you have a 282+ NFD then I think you can get 5 arcane blasts in before life exchange.