Confidence:StrongSolidPlausibleTentativeSpeculative

• Hexavus

  6

  Artifact Creature — ConstructC

  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.
• 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

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

  2

  Artifact — EquipmentC

  Phyrexian Prowler has activated abilities that aren't mana abilities, fueling Illusionist's Bracers's activation-trigger.