Demonic tutor or/and
diabolic intent are better options that
diabolic tutor and help you cut mana average, this is a mainly
dragon oriented deck it will be hard to play your strong cards in you don't manage to tutor your stuff
ashnod's altar and/or
phyrexian altar could be good choice for mana ramp if you manage to produce more tokens to sacrifice, i know that im suggesting this cards and im guilty for not having it on my own deck but some how it's holding it self better that expected since my deck is more oriented towards control.