MScore: 9.3/10
The Water Crystal
Legendary Artifactrare
Blue spells you cast cost 
less to cast.
If an opponent would mill one or more cards, they mill that many cards plus four instead.
, 
: Each opponent mills cards equal to the number of cards in your hand.
"Crystal of water, may you regain your light." —Aria Benett
Illustrated by Pablo Mendoza · Final Fantasy Promos · #85s
Rulings for The Water Crystal
5
2025-06-06
The cost reduction applies only to generic mana in the total cost of blue spells you cast.
2025-06-06
If an opponent is instructed to put a card into their graveyard without using the word "mill," The Water Crystal's second ability doesn't apply.
2025-06-06
In the rare case where you control two of The Water Crystal, each opponent mills eight more cards than originally instructed. If you control three, your opponents mill twelve more, and so on.
2025-06-06
Some older cards have received errata to instruct a player to mill cards rather than to put the top cards of their library into their graveyard. Use the Oracle™ card reference at Gatherer.Wizards.com to determine whether a specific card has received such errata. As a rule of thumb, if an effect instructs a player to look at or reveal a card before it's put into its owner's graveyard, it's unlikely to have received errata.
2025-06-06
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Water Crystal's first ability). The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.
