I also have some results to post as I played 4c Delver decks over the past 3 weeks in various small tournaments. All 3 lists were different and the first one is more black heavy (more like the Grixis green thread). I finished 1st or tied for 1st in all 3 tournaments. Here are the results and the lists:
1st tournament (Treasure Cruise was not legal yet)
0-2 vs. BUG Landstill
2-1 vs. Miracle Control
2-1 vs. DnT
2-0 vs. Team America
4
Deathrite Shaman4
Delver of Secrets3
True-Name Nemesis2
Tombstalker1
Liliana of the Veil3
Spell Pierce3
Abrupt DecaySideboard2
Thoughtseize2
Pyroblast2
Envelop1
Ancient Grudge1
Dismember2
Marsh Casualties1
Liliana of the Veil1
Jace, the Mind Sculptor1
Vendilion Clique1
Pithing Needle1
Grafdigger's Cage
20 Lands (8 fetch, 3 Udg Sea, 2 Trop, 2 Volc, 1 Badlands)
This deck focused more on black than green and favored cards like Marsh Casualties over Golgari Charm, and Liliana over Diabolic Edict both in the main and the side.
2nd tournament (Treasure Cruise was not legal yet)
2-0 vs. UB Control w/ CounterTop
2-1 vs. Elves
2-1 vs. Deathblade
For this small tournament I was using the following configuration:
4
Deathrite Shaman4
Delver of Secrets4
True-Name Nemesis2
Tarmogoyf3
Spell Pierce3
Abrupt DecaySideboard2
Envelop2
Pyroblast2
Diabolic Edict1
Counterspell1
Golgari Charm1
Ancient Grudge1
Forked Bolt1
Life from the Loam1
Sylvan Library1
Pithing Needle1
Grafdigger's Cage1
Vendilion Clique
20 Lands (8 fetch, 3 Udg Sea, 3 Trop, 2 Volc)
This was mostly a test run as I wanted to try out more mana and Nemesis > Goyf. It worked out fine but in the end I did return to 4 Goyfs.
3rd tournament (Treasure Cruise was legal)
2-0 vs. Esperblade
2-1 vs. MUD
2-1 vs. Team America
Using:
4
Deathrite Shaman4
Delver of Secrets4
Tarmogoyf1
Vendilion Clique3
Spell Pierce3
Stifle2
Abrupt DecaySideboard2
True-Name Nemesis2
Envelop2
Pyroblast2
Golgari Charm1
Abrupt Decay1
Diabolic Edict1
Ancient Grudge1
Life from the Loam1
Sylvan Library1
Pithing Needle1
Grafdigger's Cage
19 Lands (8 fetch, 2 Trop, 2 Udg Sea, 2 Volc,
1 Bayou)
This iteration focused more on reactive play by moving TNN to the SB and playing Stifles. Bayou is much stronger than Taiga on all accounts as there are far more cards that require black mana than green mana.
Moving forward I really like the last deck's manabase and was really welcoming the Bayou. The first list I tried had Tombstalker which was an absolute bomb whenever I would land him against most decks but now that we have Treasure Cruise available, I will definitely be using that card as my new bomb. Stifle was a bit underwhelming overall and will probably make way for TC. With only Spell Pierce left as a reactive spell I believe TNN is much better than Clique as a mainboard card.