Cruel Alliance {2}{B}
Sorcery
Teamwork 2 (As an additional cost to cast this spell, you may tap any number of creatures you control with total power 2 or more.)
Exile target creature with mana value 3 or less. If this spell was cast using teamwork, instead exile target creature and you gain 3 life.
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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.