Its hard to understand what the devs are thinking with the current balance. I feel like the Herald sticker is pretty reasonably balanced for its 3 gold cost. Then they added this new trinket the wolfhead flail which also costs 3 gold but its just so much better.
Since it triggers during tavern phase the deathrattle buffs are permanent. Additionally, you can combine it with a drakkari enchanter to proc multiple times.
I had a much stronger tasty lobster board compared to another player, but they were offered the wolfhead flail and I wasnt, within a couple turns they were 10x stronger and easily took 1st.
I dont expect all the trinkets to be equally powerful, but this imbalance is just outrageous.