Confidence:StrongSolidPlausibleTentativeSpeculative

• Insidious Roots

  BG

  EnchantmentBG

  Both cards produce the same kind of effect (shared token subtype).
• Zaxara, the Exemplary

  1BGU

  Legendary Creature — Nightmare HydraBGU

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

  5GG

  Creature — ElementalG

  Both cards produce the same kind of effect (shared token subtype).
• Phylath, World Sculptor

  4RG

  Legendary Creature — ElementalGR

  Both cards produce the same kind of effect (shared token subtype).
• Polukranos Reborn // Polukranos, Engine of Ruin

  GGG

  Legendary Creature — Hydra // Legendary Creature — Phyrexian HydraGW

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

  2GG

  EnchantmentG

  Deliberate damage: one card deals damage to your own creatures on purpose — a fight, a targeted ping, or a standing effect that hits them every turn — and the other rewards being dealt damage: the enrage pattern.
• Sygg, Wanderwine Wisdom // Sygg, Wanderbrine Shield

  1U

  Legendary Creature — Merfolk Wizard // Legendary Creature — Merfolk RogueUW

  Both cards trigger on damage dealt — they fire together.
• Reanimate

  B

  SorceryB

  Reanimate puts Sprouting Phytohydra onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Fblthp, Impossibly Lost

  1U

  Legendary Creature — HomunculusU

  Both cards trigger on damage dealt — they fire together.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Sprouting Phytohydra onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• The Beast, Deathless Prince

  2BR

  Legendary Creature — DemonBR

  Both cards trigger on damage dealt — they fire together.
• Vraska the Unseen

  3BG

  Legendary Planeswalker — VraskaBG

  Both cards trigger on damage dealt — they fire together.
• Cryoshatter

  U

  Enchantment — AuraU

  Both cards trigger on damage dealt — they fire together.
• Sleep Magic

  U

  Enchantment — AuraU

  Both cards trigger on damage dealt — they fire together.
• Wayta, Trainer Prodigy

  RGW

  Legendary Creature — Human WarriorGRW

  Wayta, Trainer Prodigy makes Sprouting Phytohydra's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Lost Jitte

  1

  Legendary Artifact — EquipmentC

  Both cards trigger on damage dealt — they fire together.
• Nissa, Voice of Zendikar

  1GG

  Legendary Planeswalker — NissaG

  Both cards produce the same kind of effect (shared token subtype).
• Puppet Master, String Puller

  2R

  Legendary Creature — Human Artificer VillainR

  Both cards trigger on damage dealt — they fire together.
• Grismold, the Dreadsower

  1BG

  Legendary Creature — Troll ShamanBG

  Both cards produce the same kind of effect (shared token subtype).
• Grakmaw, Skyclave Ravager

  1BG

  Legendary Creature — Hydra HorrorBG

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

  G

  Creature — Elf ArcherG

  Scattershot Archer deals damage to many targets, fueling Sprouting Phytohydra's damage-payoff trigger.
• The Necrobloom

  1WBG

  Legendary Creature — PlantBGW

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

  4GG

  SorceryG

  Both cards produce the same kind of effect (shared token subtype).
• Witch-king of Angmar

  3BB

  Legendary Creature — Wraith NobleB

  Both cards trigger on damage dealt — they fire together.
• Delney, Streetwise Lookout

  2W

  Legendary Creature — Human ScoutW

  Delney, Streetwise Lookout makes Sprouting Phytohydra's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.