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Or really any reason

The cards are random and you may not get the card you NEED to make a certain deck perfect for a certain club

You might even want to shut off your own Abilities to get through the Alolan Vulpix VSTARs attack so you can score an OHKO

While it is strong in a tournament setting, its games are going to be one-sided

Probably the most appealing use of Arcane Adaptation is using it to enable combos or powerful synergies

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