While 10 mana is a lot, starting with an indestructible, hexproof Dragonlord's Fervent in the command zone is a pretty sweet deal, and if you ever actually cast The Ur-Dragon, it should only take a single attack to close out the game
Easily the highlight of this expansion are cards featuring A Goofy Movie
In Commander, there are plenty of ways to generate unbelievable amounts of energy get something like a Sphinx of the Revelation going and Galvanic Discharge practically removes any creature by the late game
This, in combination with Big Welcome, makes the monsters of this archetype very difficult to truly get rid off, barring banishment or negating Lady to remove her protection, and even then they are able to evade such effects through Big Welcome's main effect and Graveyard effect returning cards to the Hand
Mimikyu can be quite the nuisance for decks that dont have an answer to its Safeguard Ability
Bonus Dungeon: If you beat the boss in the second video game adaptation twice, you unlock the Sealed Fortress, where you can battle nine characters for rare booster packs