Sure, the Unique cards in Sorcery can be very impactful, but they are certainly not necessary to win games. In Sorcery: Contested Realm, you only get to play 1 copy of a Unique card in your deck. That means that they sometimes not even show up in a game.

In this video Geoffrey from the Helpful Hobs shows you three budget decks which are still very competetive. You can copy a deck as is, or use them as an inspiration to build your own!