I keep seeing ER, what is it?

(Damiad ) #1

I just came back after a long hiatus and I’m still rather new anyway, I only played a bit before leaving for a long time. Anyway I’ve been seeing ER in reference to sets and do not know what that means.
Sorry if this should be posted somewhere else. You can delete it if needed.

(Sima Seal4) #2

Extremely Rare. Unless you’re talking about something else.