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After milling half of your opponents deck, you can use Riverchurn Monuments Exhaust ability to mill your opponent out

It has a pretty terrible ability that forces you to discard cards from the top of your deck, but that might work with Garchomp ex to get Energy in your discard pile to use with Hydro Launcher

It also goes without saying that just because you have a bad matchup against a certain deck that doesnt mean you will always lose

Coat of Arms was a card I had made many moons ago as a card to help boost tribal decks (then just something random players did for funwe hadn't yet built any block themes around it)