Desert Merc -- 3/3 is bad, agree.
Too many weak Deception creatures. Lack of 1 health here and there, as a result, Deception creatures too often die because of all sorts of spells and overkill.
I hope the new set will improve it, at least, I see an attempt there.
Vault Vagabond -- You are right. I tried to substitute Ludia's Dedicant with a creature that fits Merc Roar.
4/2 Hidden -- 2 health is a catastrophe, I believe. If you must trade, 3-mana Paladin can be traded for 1-mana Vanguard Axewoman. Streetslinkers are better, they are the backline but ... not Guild.
Prison Escapee -- slow and 2 health, as always - one ping and an arrow of a 1-mana creature -- dead. But... if you can't ping, he can be a curse.
Thank you for stopping by and advice... This WR, I will play Death. I need to have a break from Guild and Deception :)