This is my third iteration of this deck. Combines aspects of the B/W lifegain decks with the B/G Rescue from the Underworld decks.
Main difference from the G/B decks is the addition of Saruli Gatekeepers and Vizkopa Guildmage at the cost of Spider Spawning, adding a couple of new synergies:
Additional Synergies:
Vizkopa Guildmage+ Nemesis of Mortals
Also works well with the Arbor Colossus, Pelakka Wurms and Rune Scarred Demon.
Vizkopa Guildmage+ Saruli Gatekeeper
Requires 7 mana, but occured occasionally
Seance acts primarily as a card advantage engine and a defence option, though late game offers a potential win condition
Additional Combo:
Rescue from the Underworld + Vizkopa Guildmage + Pelakka Wurm or Saruli Gatekeeper
Rescue from the underworld targeting Vizkopa Guildmage and Pelakka Wurm/Saruli Gatekeeper facilitates multiple activations of Vizkopa Guildmage when they return during your upkeep. 2-3 activations were common, resulting in 14-21 lifeloss. I found this combo effective against most decks: removal can't be used to respond to rescue from the underworld because sacrificing is part of the cost.
Seance + Vizkopa Guildmage activating its abilities on a big creature in play
Seance + Pelakka Wurm or Saruli Gatekeeper with Vizkopa in play
G/B/W Lifegain/Graveyard
Land 23
4x
Selesnya Guildgate4x
Orzhov Guildgate4x
Golgari Guildgate6x
Forest3x
Plains2x
SwampSpells 8
1x
Treasured Find3x
Cultivate2x
Seance2x
Rescue from the Underworld2x
Planar CleansingCreatures 26
4x
Satyr Wayfinder4x
Elvish Visionary3x
Wall of Omens2x
Vizkopa Guildmage4x
Saruli Gatekeeper1x
Shadowborn Demon2x
Nemesis of Mortals1x
Arbor Colossus3x
Pelakka Wurm2x
Rune-Scarred Demon