Croaking Counterpart/Legend copy failure
Croaking Counterpart is a frog that copies a creature. My opponent casted an Etali, legendary creature. Through some amazing pulls. He was able to cast 3 croaking counterparts as part of the etali run. All 4 of them stayed on the board after resolution. This should not be the case. Each one still resolves, but the legend rule is supposed to prohibit this. 3 of these 4 should have gone to the graveyard after the run resolves. He should not have been able to attack with all 4 and they all stayed. I would guess this is a problem when CC copies all legends, allows multiple versions to remain
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[Deleted User] commented
Did your opponent have a Mirror Box in play? It would allow them to ignore the Legendary rule.