Confidence:StrongSolidPlausibleTentativeSpeculative

• Delney, Streetwise Lookout

  2W

  Legendary Creature — Human ScoutW

  Delney, Streetwise Lookout makes River Song's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Annie Joins Up

  1RGW

  Legendary EnchantmentGRW

  Annie Joins Up makes River Song'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 River Song'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 River Song'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 River Song's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Reanimate

  B

  SorceryB

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

  W

  SorceryW

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

  B

  SorceryB

  Unearth puts River Song 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 River Song onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Can't Stay Away

  WB

  SorceryBW

  Can't Stay Away puts River Song 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 River Song onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Resistance Is Futile

  1B

  SorceryB

  Resistance Is Futile puts River Song onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Animate Dead

  1B

  Enchantment — AuraB

  Animate Dead puts River Song onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Exhume

  1B

  SorceryB

  Exhume puts River Song onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Return Triumphant

  1W

  SorceryW

  Return Triumphant puts River Song onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Life // Death

  G1B

  Sorcery // SorceryBG

  Life puts River Song 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 River Song onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Recommission

  1W

  SorceryW

  Recommission puts River Song onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Call a Surprise Witness

  1W

  SorceryW

  Call a Surprise Witness puts River Song onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Soul Exchange

  BB

  SorceryB

  Soul Exchange puts River Song onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Rat King, Verminister

  1B

  Legendary Creature — Rat AvatarB

  Rat King, Verminister puts River Song onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• City on Fire

  5RRR

  EnchantmentR

  River Song deals damage, and City on Fire makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Fiery Emancipation

  3RRR

  EnchantmentR

  River Song deals damage, and Fiery Emancipation makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Sawhorn Nemesis

  3R

  Creature — DinosaurR

  River Song deals damage, and Sawhorn Nemesis makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Rem Karolus, Stalwart Slayer

  1RW

  Legendary Creature — Human KnightRW

  River Song deals damage, and Rem Karolus, Stalwart Slayer makes each hit bigger — it doubles, triples or adds to the damage your sources deal.