Where's Mad Auntie? I personally use grim harvest rather than boggart birth rite but I guess it's okay since wort can bring it back. Maybe you can make it just three then. Rather than stingscrouger, maybe you can replace it with mogg war marshal. Echo cost is lower and if you can't pay the echo cost, you'd still have a 1/1 goblin token in play.
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My piece... Since you only have 20 lands, make them snow-covered swamps so you can change drudge skeletons with rimebound dead. You can change fog of gnats with vampire bats and add some shriekmaw. You need creature cards in your graveyard too to cast avatar of woe fast and at the same time make mortivore bigger. Hope it helps.
Maybe instead of Benalish Cavalry, you should try Knight of Meadowgrain and instead of Mind rot, funeral charm. For sideboards, try the knights on Coldsnap.