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I can't find Daxos of Meletis anywhere in the deck editor, in commander and normal. Am I just doing something wrong? I just started using forge a few days ago and wanted to use him as my commander.

Forge doesn't support 100% of all cards (although we do support the most cards for all of the rules engines that I'm aware of). This card uses the "may spend mana as though" mechanic which is why it's currently not supported.