mtg sealed unlimited booster box Avatar: The Last Airbender Collector and a full Sealed Unlimited Booster box! Pack

These were generally cards that were seen to be too problematic when you always had access to them from the command zone (Rofellos, Llanowar Emissary is a great example, as it could consistently come out on turn 2, or even turn 1 with a particularly spicy hand!)

Gavony Dawnguard will help you dig for smaller creatures every time the Day/Night cycle changes

The math on cards like Flare of Duplication and Eldritch Evolution totally changes when you have access to something like this at all times

The visually stunning illustrations on MTG cards contribute significantly to their appeal and collectible value

The flavour text, however, notes that orcish armies use goblins as spies

I think deck designers are still learning from this one