Then put all cards exiled this way that werent cast on the bottom of your library in a random order. (This is the only part of the interaction that is affected by the rules change.) So with Cascade, this means that the combined converted mana costs of both halves of the card need to be less than the CMC of the spell thats the source of the Cascade trigger

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Possibly even an Assassins Trophy, if your opponent managed to sneak a creature out
We move even farther from a pump spell when looking at permanents that give a constant bonus to a creature or group of creatures