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While at this time it would be exes, in the future, this would be whatever the generational gimmick is, e.g.: Lv.X, EX, GX, V, ex (SV) Discontinued/Revised Rarities note: just because there is something here now, doesn't mean it wont come back in the future

Sneasel's dominance was driven by its free Retreat Cost and its overpowered attack, Beat Up

One of the Cosmoem you linked would fall into this category, but note that it's not a good example because 1) it's an evolved Pokemon, meaning it takes resources to establish, and 2) it's got a substantial retreat cost

It's a great LotR piece but a questionable Magic card