Thwart {2}{U}{U}
Instant
You may return three Islands you control to their owner's hand rather than pay this spell's mana cost.
Counter target spell.
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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.
Ensnare 99%
$0.64#13442
"You may return two Islands you control to their owner's hand rather than pay this spell's mana cost."
Gush 99%
$2.87#6073
"You may return two Islands you control to their owner's hand rather than pay this spell's mana cost."