If it was me, I'd use my minions to kills the Abomination, then play Doomguard onto an empty board and go 5 to the face. The opponent would have to deal with a 5/7 at the start of his turn.
Which is what the original post was saying should have happened. Instead, he Soulfire'd the Abom, lost his board, and discarded Doomguard.
I'm confused :x