Confidence:StrongSolidPlausibleTentativeSpeculative

• Tinybones Joins Up

  B

  Legendary EnchantmentB

  Petrahydrox bounces a permanent, enabling Tinybones Joins Up's recast / spell-cast trigger.
• Spreading Plague

  4B

  EnchantmentB

  Petrahydrox bounces a permanent, enabling Spreading Plague's recast / spell-cast trigger.
• Season of Growth

  1G

  EnchantmentG

  Petrahydrox bounces a permanent, enabling Season of Growth's recast / spell-cast trigger.
• Kiora, Master of the Depths

  2GU

  Legendary Planeswalker — KioraGU

  Petrahydrox bounces a permanent, enabling Kiora, Master of the Depths's recast / spell-cast trigger.
• Grist, Voracious Larva // Grist, the Plague Swarm

  G

  Legendary Creature — Insect // Legendary Planeswalker — GristBG

  Petrahydrox bounces a permanent, enabling Grist, Voracious Larva's recast / spell-cast trigger.
• Sunstrike Legionnaire

  1W

  Creature — Human SoldierW

  Petrahydrox bounces a permanent, enabling Sunstrike Legionnaire's recast / spell-cast trigger.
• Tribute to the World Tree

  GGG

  EnchantmentG

  Petrahydrox bounces a permanent, enabling Tribute to the World Tree's recast / spell-cast trigger.
• Arcades, the Strategist

  1GWU

  Legendary Creature — Elder DragonGUW

  Petrahydrox bounces a permanent, enabling Arcades, the Strategist's recast / spell-cast trigger.
• Sylvan Anthem

  GG

  EnchantmentG

  Petrahydrox bounces a permanent, enabling Sylvan Anthem's recast / spell-cast trigger.
• Slash, Reptile Rampager

  3RR

  Legendary Creature — Mutant Berserker TurtleR

  Petrahydrox bounces a permanent, enabling Slash, Reptile Rampager's recast / spell-cast trigger.
• Dinosaur Egg

  1G

  Creature — Dinosaur EggG

  Petrahydrox bounces a permanent, enabling Dinosaur Egg's recast / spell-cast trigger.
• Legolas Greenleaf

  2G

  Legendary Creature — Elf ArcherG

  Petrahydrox bounces a permanent, enabling Legolas Greenleaf's recast / spell-cast trigger.
• Death Match

  3B

  EnchantmentB

  Petrahydrox bounces a permanent, enabling Death Match's recast / spell-cast trigger.
• Dire Undercurrents

  3U/BU/B

  EnchantmentBU

  Petrahydrox bounces a permanent, enabling Dire Undercurrents's recast / spell-cast trigger.
• Elas il-Kor, Sadistic Pilgrim

  WB

  Legendary Creature — Phyrexian Kor ClericBW

  Petrahydrox bounces a permanent, enabling Elas il-Kor, Sadistic Pilgrim's recast / spell-cast trigger.
• Galadriel, Light of Valinor

  2GWU

  Legendary Creature — Elf NobleGUW

  Petrahydrox bounces a permanent, enabling Galadriel, Light of Valinor's recast / spell-cast trigger.
• The Irencrag

  2

  Legendary ArtifactC

  Petrahydrox bounces a permanent, enabling The Irencrag's recast / spell-cast trigger.
• Intruder Alarm

  2U

  EnchantmentU

  Petrahydrox bounces a permanent, enabling Intruder Alarm's recast / spell-cast trigger.
• Brilliant Wings

  1W

  Enchantment — AuraW

  Petrahydrox bounces a permanent, enabling Brilliant Wings's recast / spell-cast trigger.
• Plaxcaster Frogling

  1GU

  Creature — Frog MutantGU

  Petrahydrox bounces a permanent, enabling Plaxcaster Frogling's recast / spell-cast trigger.
• Warleader's Call

  1RW

  EnchantmentRW

  Petrahydrox bounces a permanent, enabling Warleader's Call's recast / spell-cast trigger.
• Agate Instigator

  1R

  Creature — Lizard RogueR

  Petrahydrox bounces a permanent, enabling Agate Instigator's recast / spell-cast trigger.
• Momo, Friendly Flier

  W

  Legendary Creature — Lemur Bat AllyW

  Petrahydrox bounces a permanent, enabling Momo, Friendly Flier's recast / spell-cast trigger.
• Rampaging Ferocidon

  2R

  Creature — DinosaurR

  Petrahydrox bounces a permanent, enabling Rampaging Ferocidon's recast / spell-cast trigger.
• Aunt May

  W

  Legendary Creature — Human CitizenW

  Petrahydrox bounces a permanent, enabling Aunt May's recast / spell-cast trigger.