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Honorable Mentions

Is the world structured around the groups (Amonkhet)

Only 39 copies were distributed to winners of a CoroCoro Comic illustration contest in 19971998, and this is the only PSA Gem Mint 10 in existence

Spatial Merging gets errata to read "Place both of them in the same slot on the planar map" instead of "Simultaneous planeswalk to both of them." My main guiding principle for these house rules was that phenomena are random, one-time events, so it was aesthetically unappealing to have them sitting in a spot, waiting to be triggered

You can even lean into Mobilize as a sub-theme, with cards like Firebender Ascension for extra tokens, and Voice of Victory for bonus triggers