i'm glad they've been working for you so far but Trips, while lacking any semblance of propriety or tact, is ultimately correct. it's not a good overall setup and even if it has been successful it's quite likely that you could make a signifacantly better one with a few modifications.
jizoh is by far the biggest issue here. he's the closest thing you have to a dps champion in your team, but his damage ouput is...really not great. he does bring a bit of utility to the team, but that's what the other three champions are for. leave them to their task and get jizoh replaced with a decent offensive champ.
sepulcher sentinel also could stand to be replaced. she's a good champion in general, but doesn't add a lot of value to the team overall outside of her increase def buff. without your collection to hand i couldn't say who to switch in for her, but i rather suspect you have at least one better candidate.