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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

Mutate 1U (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own

You steal your opponents best creature and then trample over their remaining blockers

It's worth noting that to get to Delirium as fast as possible, you can play both cards that can self-mill or find ways to put cards into your graveyard that have not one, but two card types on them

Responding to a call from Mark Rosewater that asked, are people upset were errata old cards that have exactly the surveil text to have Surveil? players were quick to show their support