>>151251734
They gain the effect of the card unless theres some dumb complex mechanic that would make it not work like:
>being unaffected
>requiring XYZ material
>Requiring being co-linked
and so on.

>>151251754
?
Its not NFL, the effect even EXISTS in Yugioh.
there are cards fucking banned for being able to skill swap.
Tyrant Neptune becomes a custom card when you use it to copy the effect of Independent Nightengale.