Fallaji Wayfarer Fallaji Wayfarer from Dominaria United Commander is a special kind of 5-color card whereas you only need to cast it, but the oracle text considers it to be all colors
The only certainty produced from these conversations came when I asked, "How bad would it be if they entered on your side, then moved to the protector's side during combat?" Finally, everyone agreed on something: it would be very confusing and distracting, would potentially shift around planeswalkers you were planning to attack, and I shouldn't have suggested such a thing
We currently don't know exactly in what way, given how new the game is, so there's no precise precedent
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Of course, the mechanic could still be tweaked at some point and show up in a later set.