@ Duxx - your ultimate play is discard to make a rat. Turn 4 is very situational. If it's an aggro deck you want to put the demon down. It's like having another removal spell. If the don't sac a guy, it's usually 6 damage, at its worst the are blocking with a smaller flier and you are getting rid if a guy anyway. In the control match up the Erebos is the choice. Play it more and it will come second nature to you.
@ soviet - the B/W deck seems to be making a surge as of late. It's better against monsters (lifebane main) and it's better against us (mono black) is that the direction we should be going ?