However, if you're able to find them, the special set versions of UPCs give you a bunch of packs from the one expansion, and they're far more popular for that reason
However, you can consider playing fewer than four copies of a card if: It gets worse in multiples (such as legendary creatures) It's only useful against certain matchups It's a win condition, and your control deck will have time to dig through the deck and find it You're stuck choosing between two cards which have equally strong, similar, but slightly different effects (you could play two of each) It's a slightly worse version of a card you have four copies of already, and you're including it because you want even more of that effect
PARADIGM SHIFT Every time new Magic cards get printed, the games paradigm shifts so what better card to start with than this one
And for three Tributes, it allows a Trap card to be added from the Graveyard to the Hand
Whether Soulbond Resolve should see play would depend on the specific strategy and synergy within the deck, as it offers a unique playstyle that can be effective in the right context