Managed to buy this one too, the time towers and some scorpions were the worst problem. It's a nice variation besides the rainbow and the sting lacking ROLs
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I think it is fair enough to use sets of 3. It is faster and most people do it. Check the decks with 3 quinted units and such. I can't see anyone using 4 eternities anyway, your position would already be pretty bad. I do prefer 4 attackers, but most draws are ok with 3. Playing with a 34 card version now, I might buy the rest as well.
A rainbow scorp deck could be stronger... After all you can hang a deathstalker on top of the damage for 2 poison damage. You can even add a forest scorpion, needs no buff to attack. If it hasnt changed, it it still neuro damage as soon as the dune scorp attacks. Has anyone made a deck with that lately?