why is Toedscruel said to be a good Trick Room setter?

Trick Room has a priority of -7 and Mycelium Might grants all Status moves negative priority. pretty much every Trick Room setter will go last upon casting it anyway, so what makes Toedscruel stand out? is it the fact that it can learn Rage Powder? genuine question, i’m trying to understand the possible niches with this Woodear Pokémon