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Meanwhile, Cobalion- EX is a wonderful counter to Seismitoad- EX and any deck vulnerable to having their Special Energy discarded

You just need to include them

There are not many other good Grass types, but Leavanny PLS caught my eye

Korvold, Fae-Cursed King specifications: Pros Synergizes with all other Sac cards A regular source of Sacrifices with no extra costs Cons Costs a lot of mana A hot target for opponents Every Sacrifice serves to make Korvold, Fae-Cursed King stronger

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