I have convinced myself that there is a very clear winner for most valuable measurable thing: Time CMC/MV acts as the Money/Time Continuum for resource management in mtg
Each Movie Pack Special Edition contains three 5-card Ultra Rare packs along with 2 of 4 Ultra Rares either Dark Magician or Blue-Eyes White Dragon, and either Krystal Dragon or Duza the Meteor Cubic
Plus, some TRIVIA for their competitive viability
Smaller stores might also be selective, taking only cards they know will sell and passing on bulk or heavily played cards
Anything you would do with a Continuous Spell Card applies with Its a Toon World!, and if it manages to be returned to the hand, it can simply be replayed at no cost, unlike the original Toon World.
In a deck with lots of energy cards this is a comfortably 7/10 but by itself it is just a bad Abrade or Searing Spear