Bug
I played champions of the Perfect, and beheld an elf token. My opponent then played a boardwipe. The token returned to the battlefield, despite Champions of the Perfect saying it must return to my hand which would destroy the token
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Satan#69466
shared this idea
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Rezzahan#77802
commented
If you beheld a token, it should have been gone the moment it got exiled, since a token not on the battlefield ceases to exist the next time state based actions are checked. Also, tokens that leave the battlefield cannot ever leave the new zone they were sent to. They will stay in that zone for the brief time until the next SBA check.
So, either a lot more is buggy here, or your description of the scenario is incomplete.