The Water Crystal

a card is milled — 772 cards in the game can cause this (The Water Crystal is one).

1. Lo and Li, Royal Advisors — When a permanent makes a player mill a card thanks to The Water Crystal, Lo and Li, Royal Advisors puts a counter on an Advisor

an artifact is cast — 3,683 cards in the game can cause this (The Water Crystal is one).

When The Water Crystal is cast:

1. Mendicant Core, Guidelight — copies a spell
2. Sai, Master Thopterist — makes a token
3. Ravenous Robots — makes a token
4. Pinnacle Emissary — makes a token
5. Mirrodin Besieged — makes a token
6. Poetic Ingenuity — makes a token
7. Digsite Engineer — makes a token
8. Myrsmith — makes a token
9. Riddlesmith — draws you 1 card
10. Dr. Madison Li — puts a counter on a permanent you control

271 other cards care about it too. These are the ones with the most connections.

a nontoken artifact enters the battlefield — 3,768 cards in the game can cause this (The Water Crystal is one).

When The Water Crystal enters:

1. Ultron, Artificial Malevolence — makes a token
2. The Prydwen, Steel Flagship — makes a token
3. Conquest Mission — puts a quest counter on itself
4. Surge Conductor — proliferates
5. Replication Specialist — makes a token
6. Weapons Manufacturing — makes a token
7. Mirrorworks — makes a token

an artifact it makes cheaper to cast — 4,531 cards in the game can cause this (The Water Crystal is one).

The Water Crystal reduces what:

1. Haunt the Network — costs
2. Efficient Construction — costs

4,528 other cards care about it too. These are the ones with the most connections.

an artifact enters the battlefield — 4,643 cards in the game can cause this (The Water Crystal is one).

When The Water Crystal enters:

1. Transplant Theorist — draws you 1 card
2. Elvish Archivist — puts 2 +1/+1 counters on itself
3. Golbez, Crystal Collector — surveils
4. Sludge Strider — makes a player lose 1 life
5. Underhanded Designs — makes each opponent lose 1 life
6. Mechan Assembler — makes a token
7. Glassdust Hulk — gets +1/+1
8. Rook Turret — draws you 1 card
9. Hedron Detonator — deals 1 damage
10. Pactdoll Terror — makes each opponent lose 1 life

206 other cards care about it too. These are the ones with the most connections.

a card in a graveyard — 7,589 cards in the game can cause this (The Water Crystal is one).

1. Vessel of Endless Rest — The Water Crystal puts cards into the graveyard that Vessel of Endless Rest can bring back
2. Fire Nation Salvagers — The Water Crystal puts cards into the graveyard that Fire Nation Salvagers can bring back
3. Bloodbond March — The Water Crystal puts cards into the graveyard that Bloodbond March can bring back
4. Heart-Shaped Herb — The Water Crystal puts cards into the graveyard that Heart-Shaped Herb can bring back
5. Enlightened Confidant — The Water Crystal puts cards into the graveyard that Enlightened Confidant can bring back
6. Tergrid, God of Fright // Tergrid's Lantern — The Water Crystal puts cards into the graveyard that Tergrid, God of Fright // Tergrid's Lantern can bring back
7. Grazing Kelpie — The Water Crystal puts cards into the graveyard that Grazing Kelpie can bring back
8. Dauthi Voidwalker — Cards The Water Crystal would put into an opponent's graveyard are exiled by Dauthi Voidwalker instead, and it can play from among them
9. Spurnmage Advocate — The Water Crystal puts cards into the graveyard that Spurnmage Advocate can bring back
10. Merfolk Windrobber — The Water Crystal fills an opponent's graveyard toward the 8 or more cards Merfolk Windrobber needs

434 other cards care about it too. These are the ones with the most connections.

anything goes to a graveyard — 7,589 cards in the game can cause this (The Water Crystal is one).

When a card hits the graveyard thanks to The Water Crystal:

1. The Haunt of Hightower — puts a +1/+1 counter on itself
2. Duskmantle Guildmage — makes each opponent lose 1 life
3. Vulturous Zombie — puts a +1/+1 counter on itself
4. Bloodchief Ascension — makes each opponent lose 2 life
5. Compost — draws you 1 card
6. Planar Void — hits a graveyard

17 other cards care about it too. These are the ones with the most connections.

a creature it makes cheaper to cast — 19,392 cards in the game can cause this (The Water Crystal is one).

The Water Crystal reduces what:

1. Extravagant Replication — costs
2. Fuss // Bother — costs
3. The Rani — costs
4. Thopter Spy Network — costs
5. Dovin, Grand Arbiter — costs
6. Kaito, Dancing Shadow — costs
7. Saheeli, Sublime Artificer — costs
8. Metallurgic Summonings — costs
9. Sanar, Unfinished Genius // Wild Idea — costs
10. Urza's Command — costs

19,382 other cards care about it too. These are the ones with the most connections.

anything enters the battlefield — 26,499 cards in the game can cause this (The Water Crystal is one).

When The Water Crystal enters:

1. HYDRA Assault Robot — deals 1 damage
2. Era of Innovation — puts a counter on a permanent you control
3. Nature's Wrath — makes a player sacrifice an Island or permanent

686 other cards care about it too. These are the ones with the most connections.

anything is cast — 31,128 cards in the game can cause this (The Water Crystal is one).

1. Sokka, Bold Boomeranger — When The Water Crystal is cast, Sokka, Bold Boomeranger puts a +1/+1 counter on itself

14 other cards care about it too. These are the ones with the most connections.