Cloud Key
Artifact
As this artifact enters, choose artifact, creature, enchantment, instant, or sorcery.
Spells you cast of the chosen type cost 
less to cast.
Illustrated by MSCHF
Formats
Not Legalstandard
Legalhistoric
Legaltimeless
Not Legalpioneer
Legalmodern
Legallegacy
Not Legalpauper
Legalvintage
Legalpenny
Legalcommander
Legaloathbreaker
Legalbrawl
Not Legalalchemy
This printing
Prices
Rulings (2)
The cost reduction applies only to generic mana in the cost of spells of the chosen type you cast.
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 Cloud Key's 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.
