This would still be doable , mind you (so long as you could somehow build a version of it with cards that existed at that time), but there'd be some serious concessions
If the target cards become illegal targets, the target player shuffles their library
Floowandereeze and the Scary Sea X TRAP Counter When your opponent would Special Summon a monster(s), while you control a face-up Tribute Summoned monster and no Special Summoned monsters: Negate the Summon, and if you do, return that monster(s) to the hand, also for the rest of this turn, your opponent cannot Special Summon, and can conduct up to 3 Normal Summons/Sets this turn, not just 1
Attack #1: CC Hyper Beam (30) Flip a coin
So while it might not be making waves at your LGS, theres clearly still some interest out there
However, since there is a condition that the enemy must be defeated, it has the disadvantage of being difficult to use in the early stages when resources are most needed, as in solving a case