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Another option is Spirit of the Labyrinth

The exhaust ability on the monument is enough to end a game on the spot when combined with other mill cards, and the Water Crystal is a cost reducer parcelled with milling power

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I would try to get Umbreon into the game early on so you can start confusing your opponent's Pokemon, but if you can't get it out early, I would recommend putting it on your bench, attaching three energy cards to it, and waiting for your opponent to put a Pokemon with a lot of energy cards attached to it in the active Pokemon spot, I would then move Umbreon into that active Pokemon spot and use Shadow Shutdown until Umbreon is knocked out or retreated, I would hope to get lucky and flip 2 coins so my opponent would have to discard all their energy on that active Pokemon

Mana Crypt costs zero to cast and immediately generates two mana which recurs every turn, though it has a chance of dealing three damage to you on your upkeep, a downside far outweighed by the absolutely ludicrous upside