Confidence:StrongSolidPlausibleTentativeSpeculative

• Nissa, Vastwood Seer // Nissa, Sage Animist

  2G

  Legendary Creature — Elf Scout // Legendary Planeswalker — NissaG

  Nissa, Vastwood Seer untaps lands, fueling A-Steadfast Unicorn's mana-hungry effect.
• Elrond, Moon-Reader

  2U

  Legendary Creature — Elf NobleU

  A-Steadfast Unicorn has activated abilities that aren't mana abilities, fueling Elrond, Moon-Reader's activation-trigger.
• Rewind

  2UU

  InstantU

  Rewind untaps lands, fueling A-Steadfast Unicorn's mana-hungry effect.
• Finale of Revelation

  XUU

  SorceryU

  Finale of Revelation untaps lands, fueling A-Steadfast Unicorn's mana-hungry effect.
• Bumi, Unleashed

  3RG

  Legendary Creature — Human Noble AllyGR

  Bumi, Unleashed untaps lands, fueling A-Steadfast Unicorn's mana-hungry effect.
• Wilderness Reclamation

  3G

  EnchantmentG

  Wilderness Reclamation untaps lands, fueling A-Steadfast Unicorn's mana-hungry effect.
• Sword of Feast and Famine

  3

  Artifact — EquipmentC

  Sword of Feast and Famine untaps lands, fueling A-Steadfast Unicorn's mana-hungry effect.
• Zacama, Primal Calamity

  6RGW

  Legendary Creature — Elder DinosaurGRW

  Zacama, Primal Calamity untaps lands, fueling A-Steadfast Unicorn's mana-hungry effect.
• Nature's Will

  2GG

  EnchantmentG

  Nature's Will untaps lands, fueling A-Steadfast Unicorn's mana-hungry effect.
• Emrakul, the Exigent Doom

  10

  Legendary Creature — EldraziC

  Emrakul, the Exigent Doom untaps lands, fueling A-Steadfast Unicorn's mana-hungry effect.
• Shadow of the Second Sun

  4UU

  Enchantment — AuraU

  Shadow of the Second Sun untaps lands, fueling A-Steadfast Unicorn's mana-hungry effect.