I've tried comboing it with necrofear and skull lair but still not that good. Necrofear banishes 3 monsters so it'll only have 900 points based on that, and there's only so many monsters you can send to your graveyard and banish overall, unless you plan to have more than 20 cards in your deck.
Duh. Necrofear and doomsday horror are incompatible because they both require banished monsters for their effect to work which means they interfere with each other's effect. Dumbass.