Interdimensional Travel Device: Several of them are around, from the duel disks of the Fusion and Xyz dimensions inhabitants, and after Reiji got ahold of Yuto's duel disk he was able to implement the same feature on the Lancers' (Standard) Disks using cards to set up coordinates
So theres definitely not a lot of either one out there at this point it seems, but theres definitely plenty of regular Unlimited to go around in comparison
Second, apart from tribal Cats (which may or may not be possible, due to the lack of cards), the only other direction to go is equipment matters, which tends to be an expensive upgrade, since you'll want various Swords, Batterskull, and Stoneforge Mystic and friends
Do they host community events
Youll need to have a lot of resources to hold up from there, be it counterspells, protection, or damage prevention, and thats why this win condition isnt much recommended
Spiral Growth dishes out 20 damage and has the possibility of adding Fire Energy cards to the Gyarados for free dependent on the luck of coin flips, of course