No. If it were a zombie or had deathtouch, then maybe. One thing to consider with delerium is that opposing Tarmogoyfs will be very large (minimum 4/5 -- pretty awkward for your 4/4). That should be a concern for a deck with a bunch of creatures that can't block.
The zombie/Bloodghast recursion with Cabal Therapy and Innocent Blood is the strongest element of the deck. If someone asked me why Zombardment is a reasonable choice for a Legacy deck, that is what I would highlight.
Cryptbreaker would be worth testing in a build with Bridge from Below and maybe Buried Alive; otherwise, it will be difficult to get three zombies in play to activate the card drawing. I also like it with Mutavault in a build with fewer colors (and perhaps Contamination and Crucible of Worlds). I think Sylvan Library or Dark Confidant is going to be superior for card drawing, so that leaves us with Cryptbreaker's other ability. The discard effect is weaker than Pack Rat, and Pack Rat isn't played in this deck, so I doubt it would make the cut. That said, it at least has tribal relevance and would be good on a stalled board.

