you should change your Drain life for consume spirit ( you gain X life not just the damage you deal) and maybe you could check cards like ogre marauder, blood speaker( goes well with demons), Raving oni-slave ( life loss but 3/3 for 2mana), painwracker oni ( 5/4 fear) However, nice ogre/demon tribal with some potential
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I know it got a high cost, but you should definitly put 1 or 2 sanguine bond (evil combo with blood tribute) in your deck with all the life gains you have. Ever heard of Urge to feed (it goes perfectly with your philosophy ''as they feed they grow stronger'') Very nice deck by the way. Looks good 1 vs 1, but awesome in multiplayer.