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So I wanted a deck utilizing Resourceful Return, which brought me to Bleak Coven Vampires. I tried many shells grixis, mardu, rakdos artifact decks, kuldotha shells, etc but no deck had a better win to loss ratio than the mbc version did.
The Borderpost also provide some much needed synergy, both with Bleak Coven and Gray Merchant profit from either their artifact typing or devotion. With all the lifegain in the deck Evincar's Justice seemed like a pretty good finisher if just chaining life drain doesn't work. Since I played Evincar's Justice I also had to find a place for Pristine Talisman they just go so well together.
The deck plays pretty well against tier 1 decks. Besides Darksteel Pendant which filters the deck, and the before mentioned cards this is very familiar with normal mbc shells, which is a pretty powerful foundation to begin with. The only problem this deck suffers from is that it might suffer from ancient grudges post sideboard, however from the 50-ish rounds I have played online this doesn't really appear to be a back breaking problem, thus grudge only feels fair.
UPDATE:
I now have 61 matches on paper with the new version of the deck after I tweaked around some numbers.
Our strongest matchup by far is kiln fiiend/blitz and mbc. Blitz is too heavily focused on their 12 creatures and MBC can't counter our 7 gray merchants, nor the evincar's justice.
The worst matchup is kuldotha, we can't deal with artifacts and their card advantage outraces our removal.
Of the 61 games I played with this newer version of the deck I won 43 matches (70.5%). As of now I am fine with this setup, although kuldotha remains a pain in my ass all other tier 1 decks feel like fair matchups.
Wins-Losses
U Delver
2-1, 2-1, 2-1, 2-1
2-0, 2-0
1-2, 1-2
0-2
Delver Fiend/Izzet Blitz
2-0, 2-0, 2-0
Boros Kuldotha/Boros Kitty
1-2, 1-2
2-1, 2-1, 2-1
0-2, 0-2
Elves
2-1, 2-1
2-0, 2-0, 2-0, 2-0
1-2
Goblins
2-1, 2-1
1-2
2-0, 2-0, 2-0
Burn
2-1, 2-1
1-2, 1-2, 1-2
2-0, 2-0
0-2
Marusa Tron
2-1, 2-1
2,0, 2-0
1-2
Izzet Tron
2-1, 2-1
2-0
Affinity
2-1
0-2
Mono black control
2-0, 2-0, 2-0, 2-0
Lovetrain
2-1
Zoo
1-2
2-1, 2-1
Jeskai Kuldotha
0-2
1-2
Golgari aristocrats
2-1
1-2