Kaervek the Merciless
Legendary Creature — Human Shaman
Whenever an opponent casts a spell, Kaervek deals damage equal to that spell's mana value to any target.
"Rats and jackals feast in his swath, but even they will not walk with him." —Mangara
5/4
イラスト：
Time Spiral#242レア英語適正
裁定
2021年3月19日
Alternative costs, additional costs, and cost reductions don't change a spell's mana value. Its mana value is still based on its mana cost.
2021年3月19日
An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
2021年3月19日
For spells with 
in their mana costs, use the value chosen for X to determine the spell's mana value.