Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts Obsessive Astronomer onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Helping Hand

  W

  SorceryW

  Helping Hand puts Obsessive Astronomer onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Unearth

  B

  SorceryB

  Unearth puts Obsessive Astronomer 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 Obsessive Astronomer onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Harmonic Prodigy

  1R

  Creature — Human WizardR

  Harmonic Prodigy makes Obsessive Astronomer's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Delney, Streetwise Lookout

  2W

  Legendary Creature — Human ScoutW

  Delney, Streetwise Lookout makes Obsessive Astronomer's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Roaming Throne

  4

  Artifact Creature — GolemC

  Roaming Throne makes Obsessive Astronomer's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Obsessive Astronomer's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Wizard's Staff

  1U

  Artifact — EquipmentU

  Wizard's Staff makes Obsessive Astronomer's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Stinkweed Imp

  2B

  Creature — ImpB

  Obsessive Astronomer draws a large number of cards, enabling Stinkweed Imp's draw-payoff or weaponized-draw effect.
• Kid Loki

  U

  Legendary Creature — God Hero VillainU

  Obsessive Astronomer draws a large number of cards, enabling Kid Loki's draw-payoff or weaponized-draw effect.
• Toothy, Imaginary Friend

  3U

  Legendary Creature — IllusionU

  Obsessive Astronomer draws a large number of cards, enabling Toothy, Imaginary Friend's draw-payoff or weaponized-draw effect.
• Red Ghost, Intangible Genius

  2UR

  Legendary Creature — Human Scientist VillainRU

  Obsessive Astronomer draws a large number of cards, enabling Red Ghost, Intangible Genius's draw-payoff or weaponized-draw effect.
• Sheoldred, the Apocalypse

  2BB

  Legendary Creature — Phyrexian PraetorB

  Obsessive Astronomer draws a large number of cards, enabling Sheoldred, the Apocalypse's draw-payoff or weaponized-draw effect.
• Niv-Mizzet, Parun

  UUURRR

  Legendary Creature — Dragon WizardRU

  Obsessive Astronomer draws a large number of cards, enabling Niv-Mizzet, Parun's draw-payoff or weaponized-draw effect.
• Ob Nixilis Reignited

  3BB

  Legendary Planeswalker — NixilisB

  Obsessive Astronomer draws a large number of cards, enabling Ob Nixilis Reignited's draw-payoff or weaponized-draw effect.
• Teferi, Hero of Dominaria

  3WU

  Legendary Planeswalker — TeferiUW

  Obsessive Astronomer draws a large number of cards, enabling Teferi, Hero of Dominaria's draw-payoff or weaponized-draw effect.
• Jolrael, Mwonvuli Recluse

  1G

  Legendary Creature — Human DruidG

  Obsessive Astronomer draws a large number of cards, enabling Jolrael, Mwonvuli Recluse's draw-payoff or weaponized-draw effect.
• Necroplasm

  1BB

  Creature — OozeB

  Obsessive Astronomer draws a large number of cards, enabling Necroplasm's draw-payoff or weaponized-draw effect.
• Mischievous Mystic

  1U

  Creature — Human WizardU

  Obsessive Astronomer draws a large number of cards, enabling Mischievous Mystic's draw-payoff or weaponized-draw effect.
• The Council of Four

  3WU

  Legendary Creature — Human NobleUW

  Obsessive Astronomer draws a large number of cards, enabling The Council of Four's draw-payoff or weaponized-draw effect.
• Worf, Son of Mogh

  1RW

  Legendary Creature — Klingon Warrior OfficerRW

  Obsessive Astronomer draws a large number of cards, enabling Worf, Son of Mogh's draw-payoff or weaponized-draw effect.
• Niv-Mizzet, the Firemind

  2UURR

  Legendary Creature — Dragon WizardRU

  Obsessive Astronomer draws a large number of cards, enabling Niv-Mizzet, the Firemind's draw-payoff or weaponized-draw effect.
• Irencrag Pyromancer

  2R

  Creature — Human WizardR

  Obsessive Astronomer draws a large number of cards, enabling Irencrag Pyromancer's draw-payoff or weaponized-draw effect.
• Knowledge Seeker

  1U

  Creature — Fox SpiritU

  Obsessive Astronomer draws a large number of cards, enabling Knowledge Seeker's draw-payoff or weaponized-draw effect.