Confidence:StrongSolidPlausibleTentativeSpeculative

• Aphelia, Viper Whisperer

  1B

  Legendary Creature — Gorgon AssassinBG

  Both cards produce the same kind of effect (shared token subtype).
• Delney, Streetwise Lookout

  2W

  Legendary Creature — Human ScoutW

  Delney, Streetwise Lookout makes Hooded Hydra'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 Hooded Hydra'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 Hooded Hydra's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Panoptic Projektor

  4

  ArtifactC

  Panoptic Projektor makes Hooded Hydra's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Sosuke's Summons

  2G

  SorceryG

  Both cards produce the same kind of effect (shared token subtype).
• Wizard's Staff

  1U

  Artifact — EquipmentU

  Wizard's Staff makes Hooded Hydra's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Reanimate

  B

  SorceryB

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

  W

  SorceryW

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

  B

  SorceryB

  Unearth puts Hooded Hydra 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 Hooded Hydra onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Xyris, the Writhing Storm

  2GUR

  Legendary Creature — Snake LeviathanGRU

  Both cards produce the same kind of effect (shared token subtype).
• Hapatra, Vizier of Poisons

  BG

  Legendary Creature — Human ClericBG

  Both cards produce the same kind of effect (shared token subtype).
• Mist-Syndicate Naga

  2U

  Creature — Snake NinjaU

  Both cards produce the same kind of effect (shared token subtype).
• Rhonas's Last Stand

  GG

  SorceryG

  Both cards produce the same kind of effect (shared token subtype).
• Fanatic of Rhonas

  1G

  Creature — Snake DruidG

  Both cards produce the same kind of effect (shared token subtype).
• Honored Hydra

  5G

  Creature — Snake HydraG

  Both cards produce the same kind of effect (shared token subtype).
• Snake Pit

  3G

  EnchantmentG

  Both cards produce the same kind of effect (shared token subtype).
• Bestial Menace

  3GG

  SorceryG

  Both cards produce the same kind of effect (shared token subtype).
• Endless Swarm

  5GGG

  SorceryG

  Both cards produce the same kind of effect (shared token subtype).
• Cobra Trap

  4GG

  Instant — TrapG

  Both cards produce the same kind of effect (shared token subtype).
• Ophiomancer

  2B

  Creature — Human ShamanB

  Both cards produce the same kind of effect (shared token subtype).
• Patagia Viper

  3G

  Creature — SnakeGU

  Both cards produce the same kind of effect (shared token subtype).
• Rite of the Serpent

  4BB

  SorceryB

  Both cards produce the same kind of effect (shared token subtype).
• Sinuous Striker

  2U

  Creature — Snake WarriorU

  Both cards produce the same kind of effect (shared token subtype).