Cheapest priced copy (Time Spiral): $0.49 at Card Kingdom, near mint, their price list as of .
Draining Whelk 
Creature — Illusion · 1/1 · Rare · Time Spiral · #57
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.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.49 to $8.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Time Spiral | 57 | Rare | $0.49 | $8.99 |
| Time Spiral Remastered | 62 | Rare | $0.49 | $0.99 |
3 rulings from Wizards of the Coast
- 19 March 2021For spells with {X} in their mana costs, use the value chosen for X to determine the spell's mana value.
- 19 March 2021Draining 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.
- 19 March 2021If 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.