Isleback Spawn 
Creature — Kraken
$0.51 #26029 0.00 18.3 years
Shroud (This creature can't be the target of spells or abilities.)
This creature gets +4/+8 as long as a library has twenty or fewer cards in it.
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Cards similar to Isleback Spawn 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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"At the beginning of your upkeep, if you have 200 or more cards in your library, you win the game."