Gush 

Instant
You may return two Islands you control to their owner's hand rather than pay this spell's mana cost.
Draw two cards.
click a line to search just that ability, click more to combine them
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 100%
$0.64#13442
"You may return two Islands you control to their owner's hand rather than pay this spell's mana cost."
Thwart 99%
$3.73#15434
"You may return three Islands you control to their owner's hand rather than pay this spell's mana cost."