Confidence:StrongSolidPlausibleTentativeSpeculative

• Intellectual Offering

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing The Water Crystal's tap activation.
• Unstoppable Plan

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing The Water Crystal's tap activation.
• Unwinding Clock

  4

  ArtifactC

  Unwinding Clock untaps all (or many) permanents, refreshing The Water Crystal's tap activation.
• Seedborn Muse

  3GG

  Creature — SpiritG

  Seedborn Muse untaps all (or many) permanents, refreshing The Water Crystal's tap activation.
• Paradox Engine

  5

  Legendary ArtifactC

  Paradox Engine untaps all (or many) permanents, refreshing The Water Crystal's tap activation.
• Dramatic Reversal

  1U

  InstantU

  Dramatic Reversal untaps all (or many) permanents, refreshing The Water Crystal's tap activation.
• Blinkmoth Infusion

  12UU

  InstantU

  Blinkmoth Infusion untaps all (or many) permanents, refreshing The Water Crystal's tap activation.
• The Haunt of Hightower

  4BB

  Legendary Creature — VampireB

  The Water Crystal mills (or dredges) cards into your graveyard, and The Haunt of Hightower pays off whenever a card — or a card of the type it names — is put into a graveyard from anywhere; the more it mills, the likelier it hits.
• Bloodchief Ascension

  B

  EnchantmentB

  The Water Crystal mills (or dredges) cards into your graveyard, and Bloodchief Ascension pays off whenever a card — or a card of the type it names — is put into a graveyard from anywhere; the more it mills, the likelier it hits.
• Vulturous Zombie

  3BG

  Creature — Plant ZombieBG

  The Water Crystal mills (or dredges) cards into your graveyard, and Vulturous Zombie pays off whenever a card — or a card of the type it names — is put into a graveyard from anywhere; the more it mills, the likelier it hits.
• Nihilith

  4BB

  Creature — HorrorB

  The Water Crystal mills (or dredges) cards into your graveyard, and Nihilith pays off whenever a card — or a card of the type it names — is put into a graveyard from anywhere; the more it mills, the likelier it hits.
• Shifting Woodland

  LandG

  Graveyard copier: one card stocks the graveyard (mill, surveil, dredge) and the other can repeatedly become a copy of a card that's there, borrowing its abilities without recasting it — the Shifting Woodland + Aftermath Analyst shape.
• Fiery Gambit

  2R

  SorceryR

  Fiery Gambit untaps lands, fueling The Water Crystal's mana-hungry effect.
• Innocuous Researcher

  3G

  Creature — Centaur DetectiveG

  Innocuous Researcher untaps lands, fueling The Water Crystal's mana-hungry effect.
• Time Spiral

  4UU

  SorceryU

  Time Spiral untaps lands, fueling The Water Crystal's mana-hungry effect.
• Dennick, Pious Apprentice // Dennick, Pious Apparition

  WU

  Legendary Creature — Human Soldier // Legendary Creature — Spirit SoldierUW

  The Water Crystal mills (or dredges) cards into your graveyard, and Dennick, Pious Apprentice pays off whenever a card — or a card of the type it names — is put into a graveyard from anywhere; the more it mills, the likelier it hits.
• Nissa, Vastwood Seer // Nissa, Sage Animist

  2G

  Legendary Creature — Elf Scout // Legendary Planeswalker — NissaG

  Nissa, Vastwood Seer untaps lands, fueling The Water Crystal's mana-hungry effect.
• Rewind

  2UU

  InstantU

  Rewind untaps lands, fueling The Water Crystal's mana-hungry effect.
• Beledros Witherbloom

  5BG

  Legendary Creature — Elder DragonBG

  Beledros Witherbloom untaps lands, fueling The Water Crystal's mana-hungry effect.
• Finale of Revelation

  XUU

  SorceryU

  Finale of Revelation untaps lands, fueling The Water Crystal's mana-hungry effect.
• Prophet of Kruphix

  3GU

  Creature — Human WizardGU

  Prophet of Kruphix untaps lands, fueling The Water Crystal's mana-hungry effect.
• Bumi, Unleashed

  3RG

  Legendary Creature — Human Noble AllyGR

  Bumi, Unleashed untaps lands, fueling The Water Crystal's mana-hungry effect.
• Sphinx of the Second Sun

  6UU

  Creature — SphinxU

  Sphinx of the Second Sun untaps lands, fueling The Water Crystal's mana-hungry effect.
• Wilderness Reclamation

  3G

  EnchantmentG

  Wilderness Reclamation untaps lands, fueling The Water Crystal's mana-hungry effect.
• Lazav, Dimir Mastermind

  UUBB

  Legendary Creature — ShapeshifterBU

  The Water Crystal mills (or dredges) cards into your graveyard, and Lazav, Dimir Mastermind pays off whenever a card — or a card of the type it names — is put into a graveyard from anywhere; the more it mills, the likelier it hits.