How many relics is required for a significant advantage? Give me examples, folks. Yall keep saying that late in War, relics become super OP. Has this actually ever been demonstrated to be the case? And if your entire vault can't fend off one deck, maybe that's an issue with how you discarded? Counters are counters. Upgrades aren't everything, as Light Trials have shown. If one fully upgraded mono is a big fear, maybe shape your discards towards a counter to whichever (*cough* aether *cough*) element it looks like you'll have to fend off?
Furthermore, they'll have been many many more opportunities for teams to collect relics than just this EC. I find it extremely unlikely that the WMs are going to go yeah, round 4 EC. Only one that can possibly change things. Definitely not making any other ECs. Nope. No more chances for relics either. Nope nope.