EmrakulEmrakul is the only legendary creature in existence that grants an immediate (and uncounterable) extra turn in the command zone, with next closest option being Medomai the AgelessMedomai the Ageless
That being said, theres one aspect of Lord of the Rings I wish Wizards of the Coast wasnt quite so faithful with: The One Ring
Why do I feel like Im forgetting something
Second, these Illusions, with the exception of Giant Cobra, are outclassed by other powerful Amethyst/Steel cards
The other cards that tempt at common are virtual vanilla creatures or simple effects like Sam's Desperate Rescue, Soothing of Smagol, and so on
Shock is a reasonably playable card, though you need some form of upside for it to be worthwhile