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Triple Acceleration Energy that fuels 3 out of its 4 energy attack cost and the new Powerful Energy, which is a colorless energy that allows your colorless Pokmon to do 20 more damage to your opponent's active

Cards that don't function within MTG's rules, but "are intuitive, and otherwise non-problematic"

The same is true if it would be exiled

Something like Sensei's Divining Top can make sure you draw instants and sorceries for your turn plus some kind of sacrifice outlet to use the demon each turn, and make room for a new one would go a long way too

Agumon is not a hard opponent, this being the start of the game and all