Confidence:StrongSolidPlausibleTentativeSpeculative

• Echoing Deeps

  Land — CaveC

  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.
• Mortuary Mire

  LandB

  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.
• Gallifrey Council Chamber

  Legendary LandC

  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.
• Elegant Parlor

  Land — Mountain PlainsRW

  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.
• Raucous Theater

  Land — Swamp MountainBR

  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.
• Conduit Pylons

  Land — DesertC

  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.
• Hidden Grotto

  LandC

  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.
• Surveillance Room

  LandC

  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.
• Ni'Var Science Academy

  LandU

  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.
• Q Continuum

  LandG

  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.
• Isu the Abominable

  3UU

  Legendary Snow Creature — YetiGUW

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Isu the Abominable's enter-the-battlefield effect.
• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Sacred Ground's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Talon Gates of Madara

  Land — GateC

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Talon Gates of Madara's enter-the-battlefield effect.
• Vesuva

  LandC

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Vesuva's enter-the-battlefield effect.
• Kodama of the East Tree

  4GG

  Legendary Creature — SpiritG

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Kodama of the East Tree's enter-the-battlefield effect.
• Amareth, the Lustrous

  3GWU

  Legendary Creature — DragonGUW

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Amareth, the Lustrous's enter-the-battlefield effect.
• Petrified Hamlet

  LandC

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Petrified Hamlet's enter-the-battlefield effect.
• Plaza of Harmony

  LandC

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Plaza of Harmony's enter-the-battlefield effect.
• Rumble Arena

  LandC

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Rumble Arena's enter-the-battlefield effect.
• Brokers Hideout

  LandC

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Brokers Hideout's enter-the-battlefield effect.
• Cabaretti Courtyard

  LandC

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Cabaretti Courtyard's enter-the-battlefield effect.
• Maestros Theater

  LandC

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Maestros Theater's enter-the-battlefield effect.
• Obscura Storefront

  LandC

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Obscura Storefront's enter-the-battlefield effect.
• Riveteers Overlook

  LandC

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing Riveteers Overlook's enter-the-battlefield effect.
• The Grey Havens

  Legendary LandC

  Sacred Ground returns creatures from the graveyard to the battlefield, re-firing The Grey Havens's enter-the-battlefield effect.