Incorrect interations or rules
I was in a standard event and my opponent had 5 expressive iterations that were played back to back
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LilFizzo#03137 commented
It is only possible to own 4 of any card unless stated in the card description, which leads one to deduce your opponent duplicated the spell or was able to play them from graveyard.
I.E Persistent Petitioners (https://www.tcgplayer.com/product/183310/magic-ravnica-allegiance-persistent-petitioners?Language=English)