Skittering Crustacean {2}{U}
Creature — Crab
{6}{U}: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.)
As long as this creature is monstrous, it has hexproof. (It can't be the target of spells or abilities your opponents control.)
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Cards that do something similar 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.
Fleecemane Lion 91%
$0.34#8664
"As long as this creature is monstrous, it has hexproof and indestructible."
Stoic Sphinx 83%
$0.17#21153
"This creature has hexproof as long as you haven't cast a spell this turn."