The difference as I remember it:
Classic: could stack but must start casting both spells before either land (You start casting invis, player 2 starts casting ivu on you, yours lands then theirs lands) Basically, It tricked the system into bypassing the no-stacking check and message
P99: Last I checked you could just cast on someone with an active invis spell and it will work, which I do not think is right, you would have gotten the stacking message.
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