Three mana dorks get you mana positive in one turn cycle, your creatures get virtual vigilance, and lots of other activated abilities get additional uses
There are a few little notes, but nothing much more: You can never choose yourself to be the protector of a battle youre casting
Additionally, the Realms and Relics Box Topper cards can be opened in surge foil, and those dominate the most expensive versions of the treatment: Ancient Tomb (reskinned as Balins Tomb) $331 Urborg, Tomb of Yawgmoth (reskinned as The Dead Marshes) $296 Gemstone Caverns (reskinned as Glittering Caves of Aglarond) $234 Double Rainbow Serialized Cards As one would expect, the serialized cards are the big winners here
Things like loot and scry are nice and do a lot of the same things as actual card draw but ultimately they are still not card advantage and don't quite scratch that itch
And, for any typal decks focusing on a single creature type, the added changeling token gives you one more to add to your stockpile
Those tokens dont sacrifice or exile either