Yeah I've had to finangle something workable for the first turn via vault skirges/god-pharoah + strike it rich since I don't really like going offensive with swiftspear as a first move, also flying + lifelink on turn 1 using any mana + 2 life is fucking awesome. Also yeah, delver and prowess don't mix, prowess needs constant creatures and instant/sorcery recursion (or at last casting more than one spell per card you draw) and ironically having enough spells to proc delver means you're going to have a weirdly tough time drawing creatures.
Maybe it could work by using creature tutors?