Moldgraf Scavenger is a great early game card for delirium-based decks, as is Obsessive Skinner. You want to get the delirium effect activated as soon as possible and I usually use things like Crop Sigil, Sinister Concoction, Vessel of Nascency to get there quickly. Benefaction of Rhonas and and Bitter Revelation are great for pulling what you want from the top deck and then discarding the rest to activate delirium. As a side note, I try to keep the same number of cards for each card type to ensure I have the best chance of getting four different card types into the graveyard ASAP. Hope this helps.