I cast an Archfiend's Vessel on my turn, but was unable to cast Village Rites afterward despite having 6 black mana available from swamps. My opponent probably thinks I roped them because I spent my whole countdown timer trying to cast the thing.

I don't know if it cost me the game or not, but I had planned to sac it with the rites, then bring it back with a Call the Death Dweller to give me at least a fighting chance.