Confidence:StrongSolidPlausibleTentativeSpeculative

• Innkeeper's Talent

  1G

  Enchantment — ClassG

  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.
• Rings of Brighthearth

  3

  ArtifactC

  Quest for Ancient Secrets has activated abilities that aren't mana abilities, fueling Rings of Brighthearth's activation-trigger.