I'm toying with both decklists (original by gowensjengen and by hanni).
I found a feeling of "slowness", I mean compared threshold we have an higher casting cost with deed + intuition, the last is very key for the deck to work.
I thought about throwing in some mox diamonds, but they require:
1) more lands, more slot to "manabase" so we lose something
2) not so sexy with pernicious deed.
Smother is ok, together with deed we have a removal for everything. So UGb is ok for me.
As regards mongrel I think this:
1) often I play intuition for loam-wonder-genesis, they give me genesis, and I need a discard engine. Genesis works from graveyard, out there would be plowed.
2) daze replace mongrel in a more controllish.... it's a good card, and with 4 duress sideboard can do some disruption to combo.
Explosives:
Often Cret belcher play all the hand for say 14 goblin turn 1. It's the only out against them, other than playing diamond for a turn 2 deed or having a force active.
Sure the deck ha potential but it's a bit slow and has few counters compared to threshold...

