Confidence:StrongSolidPlausibleTentativeSpeculative

• Vizier of Remedies

  1W

  Creature — Human ClericW

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Tataru Taru

  1W

  Legendary Creature — Dwarf AdvisorW

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• Rings of Brighthearth

  3

  ArtifactC

  Glen Elendra Guardian has activated abilities that aren't mana abilities, fueling Rings of Brighthearth's activation-trigger.
• Illusionist's Bracers

  2

  Artifact — EquipmentC

  Glen Elendra Guardian has activated abilities that aren't mana abilities, fueling Illusionist's Bracers's activation-trigger.