Confidence:StrongSolidPlausibleTentativeSpeculative

• Watchful Radstag

  2G

  Creature — Elk MutantG

  Both cards produce the same kind of effect (shared token subtype).
• Oko, Lorwyn Liege // Oko, Shadowmoor Scion

  2U

  Legendary Planeswalker — Oko // Legendary Planeswalker — OkoGU

  Both cards produce the same kind of effect (shared token subtype).
• Rings of Brighthearth

  3

  ArtifactC

  Oko, the Ringleader has activated abilities that aren't mana abilities, fueling Rings of Brighthearth's activation-trigger.