Putting together a (cheap!) deck around a turn 3 Desecration Demon; acceleration, removal, and beaters. Some draw too.

4x arbor elf and farseek makes turn 3 desecration demon pretty likely, and even a turn 3 bloodgift demon/vraska/thragtusk possible. Arbor elves also untap underworld connections lands, and fix black by untapping overgrown tombs brought out with farseek.

There's just enough life gain that the cards for life doesn't hurt too bad, and the Burst of Strength is there to untap Desecration Demons after they sac to it - swinging with 2 counters on it (plus it's nice to untap a Vampire Nighthawk that had attacked to block, kill, and lifegain).

Dreg Mangler, Knight of Infamy, and Lifebane Zombie all feel pretty random (though they're all nice on turn 2 and do something useful), so I'd like suggestions that aren't too expensive.