Confidence:StrongSolidPlausibleTentativeSpeculative

• Rodolf Duskbringer

  5B

  Legendary Creature — Vampire AngelBW

  Lifegain pair: one card gains life while the other rewards lifegain. They reinforce each other in a lifegain deck.
• Likeness Looter

  UB

  Creature — Faerie ShapeshifterBU

  Graveyard copier: one card stocks the graveyard (mill, surveil, dredge) and the other can repeatedly become a copy of a card that's there, borrowing its abilities without recasting it — the Shifting Woodland + Aftermath Analyst shape.
• Fiendish Panda

  2WB

  Creature — Bear DemonBW

  Lifegain pair: one card gains life while the other rewards lifegain. They reinforce each other in a lifegain deck.
• Baron Helmut Zemo

  BBB

  Legendary Creature — Human Noble VillainB

  Copy engine: one card makes a copy of a creature every turn, and the other's enter-the-battlefield effect rewards each copy. Real, repeatable value — the partner can't untap or re-enter the copier, so it never goes infinite.
• Basri, Tomorrow's Champion

  W

  Legendary Creature — Human KnightW

  Basri, Tomorrow's Champion has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Unearth

  B

  SorceryB

  Unearth has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Flame Blitz

  R

  EnchantmentR

  Flame Blitz has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Jolted Awake

  W

  SorceryW

  Jolted Awake has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Decree of Annihilation

  8RR

  SorceryR

  Decree of Annihilation has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Decree of Pain

  6BB

  SorceryB

  Decree of Pain has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Mirrorhall Mimic // Ghastly Mimicry

  3U

  Creature — Spirit // Enchantment — AuraU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Neutralize

  1UU

  InstantU

  Neutralize has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Resounding Thunder

  2R

  InstantBGR

  Resounding Thunder has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Boon of the Wish-Giver

  4UU

  SorceryU

  Boon of the Wish-Giver has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Spectacular Pileup

  3WW

  SorceryW

  Spectacular Pileup has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Webstrike Elite

  GG

  Creature — Insect ArcherG

  Webstrike Elite has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Intimidation Tactics

  B

  SorceryB

  Intimidation Tactics has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Viashino Sandsprinter

  1RR

  Creature — Lizard WarriorR

  Viashino Sandsprinter has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Akroma's Vengeance

  4WW

  SorceryW

  Akroma's Vengeance has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Pest Control

  WB

  SorceryBW

  Pest Control has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Unpredictable Cyclone

  3RR

  EnchantmentR

  Unpredictable Cyclone has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Dino DNA

  1

  ArtifactC

  Copy engine: one card makes a copy of a creature every turn, and the other's enter-the-battlefield effect rewards each copy. Real, repeatable value — the partner can't untap or re-enter the copier, so it never goes infinite.
• Easy Prey

  1B

  InstantB

  Easy Prey has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Shredded Sails

  1R

  InstantR

  Shredded Sails has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Expunge

  2B

  InstantB

  Expunge has cycling, and Golgari Brownscale pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.