Disdainful Stroke
Instant
Counter target spell with mana value 4 or greater.
"You are beneath contempt. Your lineage will be forgotten."
Illustrated by
Khans of Tarkir#37CommonEnglishLegality
Rulings
Feb 5, 2021
If a spell has 
in its mana cost, use the value chosen for X when determining the spell's mana value.
Mar 19, 2021
A face-down spell has mana value 0 and can't be targeted by Disdainful Stroke.