Crystal fragments bug interaction with firion, wild rose warrior
If you activate the copy of crystal fragments made by Firion and exile it to turn it into alexander, the card just exiles and doesn't come back as the transformed card.
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Rezzahan#77802
commented
A token that leaves the battlefield, cannot leave the zone it is moved to. It ceases to exist the next time state based actions are checked. If it were simply transforming, you'd get Summon: Alexander, but it is exiled and then the game tries to return it transformed, which the rules forbid.
111.8. A token that has left the battlefield can’t move to another zone or come back onto the battlefield.
If such a token would change zones, it remains in its current zone instead. It ceases to exist the next
time state-based actions are checked; see rule 704