Great! So other ideas for the deck could be some way to enable the Delirium creatures faster. A good way to do this is to use
Satyr Wayfinder and maybe
Commune with the Gods.
Winding Way is also a great card here.
Another "problem" I see is that you don't have any Instant cards in the deck, could be a good idea to add some instants to have another ingredient to enable Delirium faster. Maybe replace
Prey Upon with
Titanic Brawl (that is an instant and will only cost 1 green if you have used
Implement of Ferocity to add some counters)
Grapple with the Past is also an instant that can also add some more stuff to the graveyard.
Pulse of Murasa is also good as an instant and can return some creatures.
Another approach could be to add
Tethmos High Priest and a couple of triggers like
Thrill of the Hunt and
Travel Preparations to bring back
Leonin Squire and
Moldgraf Scavenger. And maybe replace
Desperate Sentry with
WerebearSome other great cards to add,
Remember the Fallen for both creatures and artifacts.
Moldervine Cloak to speed up the delirium trigger.
Kirtar's Desire is good removal if you use all the mill cards.
Just some ideas