Alright, pretty sure I just can't lose now from that bottom-right corner. The Berserker's Club is free to use and permanently does 0 damage due to the hourglass. Just put on a little poison and you can infinitely stack poison (rag will also keep clearing it if you only put one on, as you get the poison too). There is one enemy that gets spikes from attacks, but candle will remove them (have yet to face them with this, but should keep up, and the block should save during that). Takes a really long time, but is reliable.