You have to go on one path, defeat all the duelists there (including Jack Atlas), then unlock the gate that leads to the second path, on which you duel all the duelists and then Yusei for another key, which unlocks the way to two Transcenders, which must be dueled, after which we go against Surtr
For this reason, adding Cyrus to your deck lets you snipe away high-priority targets by pulling them back to the active spot
This wily little creature is up there with Light-Paws in my top cards of the set
With Jasmine, its damage-absorbing capacity, and a Pokmon Tool like Steel Apron (will be discussed soon), it can stall while you set up Solgaleo EX on your Bench
Luckily, the Pokmon Trading Card Game has a wide variety of consistency cards that nearly every deck can use, and one of these phenomenal cards is Arven