This list 5-0ed at a big mtgo tourney. Karn looks like it has potential...

Eldrazi Post
Creatures (13)
3 Walking Ballista xx 45.03
4 Thought-Knot Seer 3c 30.40
4 Endbringer 5c 2.44
2 Ulamog, the Ceaseless Hunger 10 79.68
Planeswalkers (5)
4 Karn, the Great Creator 4 39.56
1 Ugin, the Spirit Dragon 8 75.35
Spells (2)
2 All Is Dust 7 13.64
Artifacts (14)
4 Chalice of the Void xx 260.00
2 Voltaic Key 1 2.48
4 Grim Monolith 2 442.16
4 Thran Dynamo 4 22.92
Lands (26)
4 Ancient Tomb 96.12
4 Cloudpost 2.84
4 Eldrazi Temple 32.04
3 Eye of Ugin 23.97
4 Glimmerpost 0.80
4 Thespian's Stage 9.80
1 Urborg, Tomb of Yawgmoth 14.99
2 Wastes 1.34

Sideboard (15)
1 Tormod's Crypt 0 0.69
1 Walking Ballista xx 15.01
2 Warping Wail 1c 0.98
2 Ensnaring Bridge 3 90.80
1 Oblivion Stone 3 7.56
1 Trinisphere 3 31.13
4 Leyline of the Void 2bb 198.84
1 Ravenous Trap 2bb 3.48
1 Mycosynth Lattice 6 36.95
1 Wurmcoil Engine 6 26.19

https://www.mtggoldfish.com/tourname...19-05-04#paper

And this 5-0 list is crazy spicy...

Creatures (3)
3 Walking Ballista xx 45.00
Planeswalkers (14)
4 Karn, Scion of Urza 4 76.00
4 Karn, the Great Creator 4 39.80
3 Ugin, the Ineffable 6 20.82
3 Ugin, the Spirit Dragon 8 226.41
Artifacts (18)
4 Chalice of the Void xx 270.60
2 Voltaic Key 1 2.48
4 Grim Monolith 2 480.00
1 Sorcerous Spyglass 2 2.99
3 Trinisphere 3 91.89
4 Thran Dynamo 4 22.80
Lands (25)
4 Ancient Tomb 96.00
4 Blast Zone 31.92
1 City of Traitors 210.00
4 Cloudpost 2.84
4 Glimmerpost 0.80
1 Karakas 20.91
4 Thespian's Stage 9.96
3 Vesuva 106.38
Sideboard (15)
1 Tormod's Crypt 0 0.69
1 Walking Ballista xx 15.00
1 Ratchet Bomb 2 1.65
1 Sorcerous Spyglass 2 2.99
2 Warping Wail 1c 0.98
3 Ensnaring Bridge 3 134.97
1 Trinisphere 3 30.63
4 Leyline of the Void 2bb 199.96
1 Mycosynth Lattice 6 35.99
75 Cards Total