Sounds simple, but it's actually very, very good
Players of Group Hug decks would answer that question with a few of their own: why are you already thinking of them as your opponents, and is beating all of them actually necessary
Dont be afraid to turn three rats into a Blood Artist or God-Eternal Bontu if that looks like the best path to victory
A standard deck with four copies of this and plenty of Villains to support it can theoretically exile 20 cards from your opponent's deck and let you play eight of them for free
The spell does need to be cast from your hand, if it gets cast from anywhere else (like with Cascade, for example), Rebound wont trigger, and so to the graveyard with the spell
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