Tidal Terror {4}{U}{U}
Creature — Octopus
Whenever this creature attacks, you may tap two other untapped creatures you control. If you do, this creature can't be blocked this turn.
Islandcycling {2} ({2}, Discard this card: Search your library for an Island card, reveal it, put it into your hand, then shuffle.)
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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.
Minas Tirith Garrison 85%
$0.50#15568
"Whenever this creature attacks, you may tap any number of untapped Humans you control. Draw a card for each Human tapped this way."
Gravelgill Scoundrel 85%
$0.13#20299
"Whenever this creature attacks, you may tap another untapped creature you control. If you do, this creature can't be blocked this turn."
Ledev Champion 80%
$0.10#25120
"Whenever this creature attacks, you may tap any number of untapped creatures you control. This creature gets +1/+1 until end of turn for each creature tapped this way."
Siege Striker 80%
$0.16#23847
"Whenever this creature attacks, you may tap any number of untapped creatures you control. This creature gets +1/+1 until end of turn for each creature tapped this way."