Damage prevention effects have a long history in MTG, stretching all the way back to Alpha with Fog
Yawgmoth's Will helps here, too, because you can reuse a Dark Ritual, a Cabal Therapy, a Duress, and so forth
All Is Dust, Ugin, the Ineffable, and Spreading Plague give the deck the biggest bang for your buck, absolutely perfect for what this deck wants to do
While this cards pack tactics ability is certainly nifty (gifting you a free 1/1 Gob if your attacking creatures powers are equal to six or more), its this cards one red and one colorless activated ability that truly shines: being able to give haste and a healthy boost to all of your Goblins powers can sometimes end a game (for one player, at least) on the spot