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He is the commissioner of a Commander league at a local LGS, Near Mint Games

12 Budding Expeditioner Canonical Mew Things The Budding Expeditioner mimics the same effect as Koga, except this time, the Pokemon you can retreat is restricted to Mew

Meet Dialga-GXand Palkia-GX, and encounter bizarre Ultra Beasts and wild new forms of Alola's Legendary Pokmon

Into the Roil might win out too as it has a two mana mode for those tempo plays

Another popular theory is that it's simply too much work for Wizards to add new formats to Arena , but this seems to be driven more by the community than Wizards itself

If anyone else knows of any, ping me