It’s not about the 1 cards. It’s about the rest. Pls check your event with level 1- 4 cards you will see a lot of same Decks with op cards . Really when you can see the balancing problems in those events why you can’t fix them.
Deck vor example priest maxi, Bebe , t&p play for your self and see your balancing probs. Events are no fun with op cards normally those games must be balanced without the op legend level 3 cards.