IMO decks like that are actually traps. By relying on solidity and ensuring decent draws every time you also lose the chance of fluctuations and getting an exceptional hand.
A deck setup like that is guaranteed to be 'solid' against most things but will rarely excel. This means that against other top end hands you'll likely be running into old threats and 50/50 situations that will inhibit really goods results in ELO
According to probability, a deck with 3 2* will give 2 2* in half its hands and all 3 in 5 hands. While you might get a supposed "Exceptional hand" you most likely end up with several predictable and inflexible hands. My strongly preferred deck builds are...
5, 4, 3, 3, 3, 3, 2, 2
4, 4, 4, 3, 3, 3, 2, 2
Any 1 card in a deck will appear in half your hands, but what good are they if backed by weak cards? 3* can and usually win games. 2*? Not so much. They mostly boil down to fillers that might allow for a 'narrow escape'.
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