Most regret comes from misreading probability, not from the odds themselves, so the better Pokemon card trading sites make those numbers prominent and plain
Going from a 1/1 to a 2/2, or a 2/2 to a 3/3 usually wont change the boardstate much, and when Amass is a big part of your spells it can make them feel quite underwhelming
I am not fully up to date on the market for these cards so someone else may be able to help, but Id say if you wanted to sell the collection as is, assuming conditions are mixed, you may make $250 or so
Best in the land ramping decks as it kills less of your own stuff
It doesnt really work well in multiplayer gameplay, either, from my playtesting
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