Confidence:StrongSolidPlausibleTentativeSpeculative

• Keiga, the Tide Star

  5U

  Legendary Creature — Dragon SpiritU

  Synergy between the two cards.
• Trudge Garden

  2G

  EnchantmentG

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

  1B

  Creature — Bat ClericB

  Lifegain pair: one card gains life while the other rewards lifegain. They reinforce each other in a lifegain deck.
• Elenda's Hierophant

  2W

  Creature — Vampire ClericW

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

  WUB

  Artifact Creature — Vedalken WizardBUW

  One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
• Dawn of Hope

  1W

  EnchantmentW

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

  5BG

  Legendary Creature — Elder DragonBG

  One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
• 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.
• Field-Tested Frying Pan

  2W

  Artifact — EquipmentW

  Lifegain pair: one card gains life while the other rewards lifegain. They reinforce each other in a lifegain deck.
• Banon, the Returners' Leader

  RW

  Legendary Creature — Human Cleric RebelRW

  Graveyard pair: one card brings creatures back from the graveyard repeatedly (or a creature that returns itself), and the other keeps feeding the loop — a recurring reanimator with a payoff, or a sacrifice outlet with a self-recurring creature.
• Captivating Glance

  2U

  Enchantment — AuraU

  Captivating Glance temporarily takes control of an opponent's creature, and Diamond Valley sacrifices it — the opponent loses the permanent for good.
• Merieke Ri Berit

  WUB

  Legendary Creature — HumanBUW

  Merieke Ri Berit temporarily takes control of an opponent's creature, and Diamond Valley sacrifices it — the opponent loses the permanent for good.
• Edea, Possessed Sorceress

  2UBR

  Legendary Creature — Human WarlockBRU

  Edea, Possessed Sorceress temporarily takes control of an opponent's creature, and Diamond Valley sacrifices it — the opponent loses the permanent for good.
• Gravecrawler

  B

  Creature — ZombieB

  Graveyard pair: one card brings creatures back from the graveyard repeatedly (or a creature that returns itself), and the other keeps feeding the loop — a recurring reanimator with a payoff, or a sacrifice outlet with a self-recurring creature.
• Varchild, Betrayer of Kjeldor

  2R

  Legendary Creature — Human KnightR

  Varchild, Betrayer of Kjeldor temporarily takes control of an opponent's creature, and Diamond Valley sacrifices it — the opponent loses the permanent for good.
• Undead Sprinter

  BR

  Creature — ZombieBR

  Graveyard pair: one card brings creatures back from the graveyard repeatedly (or a creature that returns itself), and the other keeps feeding the loop — a recurring reanimator with a payoff, or a sacrifice outlet with a self-recurring creature.
• Timeline Culler

  BB

  Creature — Drix WarlockB

  Graveyard pair: one card brings creatures back from the graveyard repeatedly (or a creature that returns itself), and the other keeps feeding the loop — a recurring reanimator with a payoff, or a sacrifice outlet with a self-recurring creature.
• Innocuous Researcher

  3G

  Creature — Centaur DetectiveG

  Innocuous Researcher untaps all (or many) permanents, refreshing Diamond Valley's tap activation.
• Fiery Gambit

  2R

  SorceryR

  Fiery Gambit untaps all (or many) permanents, refreshing Diamond Valley's tap activation.
• Garland, Royal Kidnapper

  2UB

  Legendary Creature — Human KnightBU

  Garland, Royal Kidnapper temporarily takes control of an opponent's creature, and Diamond Valley sacrifices it — the opponent loses the permanent for good.
• Nicol Bolas, Planeswalker

  4UBBR

  Legendary Planeswalker — BolasBRU

  Nicol Bolas, Planeswalker temporarily takes control of an opponent's creature, and Diamond Valley sacrifices it — the opponent loses the permanent for good.
• The Beast, Deathless Prince

  2BR

  Legendary Creature — DemonBR

  The Beast, Deathless Prince temporarily takes control of an opponent's creature, and Diamond Valley sacrifices it — the opponent loses the permanent for good.
• The Nipton Lottery

  2BR

  SorceryBR

  The Nipton Lottery temporarily takes control of an opponent's creature, and Diamond Valley sacrifices it — the opponent loses the permanent for good.
• Geyadrone Dihada

  1UBR

  Legendary Planeswalker — DihadaBRU

  Geyadrone Dihada temporarily takes control of an opponent's creature, and Diamond Valley sacrifices it — the opponent loses the permanent for good.