Draining Whelk
Creature — Illusion
Flash
Flying
When this creature enters, counter target spell. Put X +1/+1 counters on this creature, where X is that spell's mana value.
1/1
イラスト：
Time Spiral#57レア英語適正
裁定
2021年3月19日
If the target spell is an illegal target by the time Draining Whelk's ability tries to resolve, the spell doesn't resolve. You don't put any counters on Draining Whelk. If the target is legal but the spell can't be countered, you do put counters on Draining Whelk.
2021年3月19日
Draining Whelk's ability counters the target spell even if you can't put counters on Draining Whelk, most likely because Draining Whelk left the battlefield before the ability resolved.
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.