Commanders stay in the command zone, cascade chains stop cold, and graveyard or exile-casting strategies suddenly have nowhere to go
96-120 lands is the most you can include at 360 before players start ending up short on playable, non-land cards. As the above table shows, the average number of unplayable cards per deck actually doesnt appear to change much based on the amount of fixing in the cube it basically hovers around 7 or 8
If our only creatures were Aetherlings and Sphinxes, we would make their dead cards good
The cost reduction can apply to alternative costs such as flashback costs
Card Name Mana Cost Type Instant Rarity Uncommon rules Text Choose one or both -* Turn target face-down creature face up.* Exile any number of face-up creatures you control with disguise in a face-down pile, shuffle that pile, then cloak them
So, while it can be fun to ruminate on the merits or drawbacks of every possible inclusion, it's never worth stressing about