Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Priest of Fell Rites

  WB

  Creature — Human WarlockBW

  Priest of Fell Rites puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Animate Dead

  1B

  Enchantment — AuraB

  Animate Dead puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Exhume

  1B

  SorceryB

  Exhume puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Life // Death

  G1B

  Sorcery // SorceryBG

  Life puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Dance of the Dead

  1B

  Enchantment — AuraB

  Dance of the Dead puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Persist

  1B

  SorceryB

  Persist puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Soul Exchange

  BB

  SorceryB

  Soul Exchange puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Bruce Banner // The Incredible Hulk

  U2RRGG

  Legendary Creature — Human Scientist Hero // Legendary Creature — Gamma Berserker HeroGRU

  Bruce Banner grants an extra combat phase, enabling Sphinx of Clear Skies's combat-trigger payoff.
• Rat King, Verminister

  1B

  Legendary Creature — Rat AvatarB

  Rat King, Verminister puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Najeela, the Blade-Blossom

  2R

  Legendary Creature — Human WarriorBGRUW

  Najeela, the Blade-Blossom grants an extra combat phase, enabling Sphinx of Clear Skies's combat-trigger payoff.
• Finest Hour

  2GWU

  EnchantmentGUW

  Finest Hour grants an extra combat phase, enabling Sphinx of Clear Skies's combat-trigger payoff.
• Genji Glove

  5

  Artifact — EquipmentC

  Genji Glove grants an extra combat phase, enabling Sphinx of Clear Skies's combat-trigger payoff.
• Yore-Tiller Nephilim

  WUBR

  Creature — NephilimBRUW

  Yore-Tiller Nephilim puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Sefris of the Hidden Ways

  WUB

  Legendary Creature — Human WizardBUW

  Sefris of the Hidden Ways puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Recurring Nightmare

  2B

  EnchantmentB

  Recurring Nightmare puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Liliana, Waker of the Dead

  2BB

  Legendary Planeswalker — LilianaB

  Liliana, Waker of the Dead puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Hell's Caretaker

  3B

  Creature — HorrorB

  Hell's Caretaker puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Kardur's Vicious Return

  2BR

  Enchantment — SagaBR

  Kardur's Vicious Return puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Meren of Clan Nel Toth

  2BG

  Legendary Creature — Human ShamanBG

  Meren of Clan Nel Toth puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Victimize

  2B

  SorceryB

  Victimize puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Ascent of the Worthy

  1WB

  Enchantment — SagaBW

  Ascent of the Worthy puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Rite of the Moth

  1WBB

  SorceryBW

  Rite of the Moth puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Soulcoil Viper

  2B

  Creature — SnakeB

  Soulcoil Viper puts Sphinx of Clear Skies onto the battlefield from a graveyard without casting it, so its mana cost is never paid.