Draining Whelk 


Creature — Illusion
$0.40 #13413 0.44 20.0 years
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.
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Cards similar to Draining Whelk expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
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"Counter target spell. Create X Treasure tokens, where X is that spell's mana value."
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"Counter target spell. If that spell's mana value was 3 or less, proliferate."
Disdainful Stroke76%
$0.09↓#2356↑0.3412.1 years↓
"Counter target spell with mana value 4 or greater."
Electrosiphon74%
$0.32↓#5812↑0.75↑2.6 years↓
"Counter target spell. You get an amount of
equal to its mana value."
Dispersal Shield74%
$0.16↓#17250↓0.4323.4 years↑
"Counter target spell if its mana value is less than or equal to the greatest mana value among permanents you control."