Probably the most appealing use of Arcane Adaptation is using it to enable combos or powerful synergies
Or really any reason
Options include: First Response, Angelic Accord, Martial Coup, Sacred Mesa, Mobilization, Captain of the Watch, Evangel of Heliod, Hero of Bladehold, Elspeth Tirel, Elspeth, Sun's Champion, Decree of Justice, Increasing Devotion Winning So we've ramped up, drew a ton of cards, made a bunch of tokens, and blew up our opponent's stuff
You might even want to shut off your own Abilities to get through the Alolan Vulpix VSTARs attack so you can score an OHKO
I've been tracking down stock across a variety of stores like a Pokemon trainer trying to find a shiny pocket monster, all so you don't have to
Turning all your artifacts into Mox Sapphire and coming into play with a massive artifact creature is great, but its activated ability gives you an outlet for all that surplus mana