Confidence:StrongSolidPlausibleTentativeSpeculative

• Rona, Herald of Invasion // Rona, Tolarian Obliterator

  1U

  Legendary Creature — Human Wizard // Legendary Creature — Phyrexian WizardBU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Leonin Battlemage

  3W

  Creature — Cat WizardW

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Merrow Levitator

  3U

  Creature — Merfolk WizardU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Elrond, Moon-Reader

  2U

  Legendary Creature — Elf NobleU

  Sigil Tracer has activated abilities that aren't mana abilities, fueling Elrond, Moon-Reader's activation-trigger.
• Rings of Brighthearth

  3

  ArtifactC

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

  2

  Artifact — EquipmentC

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