Where VictimizeVictimize brings back two creatures for sacrificing one, Whisper brings back one creature by sacrificing two
to cascade, you exile cards from the top of your library until you exile a nonland card with mana value lesser than the cascade card, which you may then cast from exile without paying its mana cost
In the show, Double Fusion seemed to have a sort of lingering effect that persisted throughout your turn, whereas with the real card you have to perform both fusion summons immediately
I've got mixed feeling about this archetype
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You only need to connect with an opponent once if you have the proliferate abilities to do the rest, but you can also pump out a bunch of tokens and grant them deathtouch with Ohran Frostfang