In practice, you shouldn't actually shuffle them into your library since they'll cease to exist as soon as Warp World finishes resolving
The Boys Are Back Realism isn't exactly what fans expected from Yu-Gi-Oh, but sometimes, the show did go overboard with the world-ending catastrophes
[edit] Fusion Monsters reappeared in the Third Arc of Yu-Gi-Oh
You may choose creatures with hexproof, for example, and choosing a creature with ward will not cause the ward ability to trigger
The problem is that this means you need to play Ghitu Lavarunner, which I dislike, as previously mentioned
The whimsical, jester-like design of Number 7: Lucky Straight has far different abilities from the demonic-looking Number 40: Gimmick Puppet of Strings