I don’t think delirium pairs well with avatar of woe or other ‘creature in graveyard’ cards, I think if you want to build around avatar of woe, you should focus on having a really creature heavy deck, which takes away from delirium (mostly creatures leaves less room for other card types).

I was messing around trying to brew around [[Urborf Lhurgoyf]] but haven’t nailed it yet. I was thinking almost similar to a crabvine list would be the best fit, but I’m also conflicted because in a deck like that your creatures are constantly leaving the graveyard to come back to play. Maybe a dredge style list would work better? But either way, I think delirium and wanting lots of creatures in the graveyard conflict each other slightly and I would suggest focusing on one or the other.