Confidence:StrongSolidPlausibleTentativeSpeculative

• Pili-Pala

  2

  Artifact Creature — ScarecrowC

  One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
• Rings of Brighthearth

  3

  ArtifactC

  Burden of Guilt has activated abilities that aren't mana abilities, fueling Rings of Brighthearth's activation-trigger.