Everyone forgets they havent even made a single shiny alt art
Time Walk $19,000 Time Walk is the most obviously strongest card on this list
It does require tapping, so you'll need to wait a turn to use it normally, but you can easily combine it with Commander Classics Swiftfoot Boots and Lightning Greaves to protect it and haste it in one swing
At first, this looks like a much, much worse Ghostly Prison, in that it doesn't actually stop attackers
For example, if you somehow used Souls of the Lost to craft Mastercraft Raptor (perhaps because it became a copy of a Dinosaur), its power while in exile is equal to the number of permanent cards in your graveyard, and Mastercraft Raptor's power will change as the number of permanent cards in your graveyard changes