EZAs are all very strong and make older and weaker Cards more viable, but it’s also a costly upgrade to make, and the majority of players will want to pick carefully which Card they want to EZA next. For this list, the main criteria are as follows:

Versatility is the golden rule; a Card with more categories or a broad and strong Leader Skill will usually be valued higher.

All Cards are assumed at Rainbow level.

How strong the Card is post-EZA.

How good the EZA is itself, or how big of an upgrade the EZA was for the Card.

To help choose between 2 Cards that share the same name, the worse Card will always fall down a tier, if two same named Cards are in the same tier, assume they are equal or they have roles that are not comparable.

F2P EZAs are not quite as good as premium ones, but farming them is eventually worth it because it’s almost always cheaper. Do not sleep on F2P Cards.