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There's some great cards in here that will be useful in your Rise of the Floodborn collection, particularly the Merlin and Madam Mim cards, but otherwise this is the least competitive deck you can get.

Magmatic Galleon is a nice piece of removal that leaves behind some value

Are there any upgrades youd make

With Gran-Gran on the battlefield, Accumulate Wisdom effectively becomes Ancestral Recall, and Combustion Technique starts to resemble Swords to Plowshares

Evasion Once weve pumped Ashad up to threatening levels, well want to send it on attacks, and giving it trample is an excellent way to do that

Your attacking options are Zacian V [Celebrations], and Gardevoir, both of which can score OHKOs by loading up Energy