
As this creature enters, choose a number.
Noncreature spells with mana value equal to the chosen number can't be cast.
"This area is off-limits to you."
Illustrated by Michael C. Hayes · Modern Horizons 2 · #491
2016-08-23
Effects that increase or reduce the cost to cast a spell don't affect that spell's mana value.
2016-08-23
For spells with {X} in their mana costs, use the value chosen for X to determine if the spell's mana value is the chosen number. For example, if the chosen number is 4, a noncreature spell with mana cost {X}{R}{R} couldn't be cast with X equal to 2, but it could be cast with X equal to any other number.