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Enchantment — Plan
Whenever one or more creatures you control become tapped, draw a card, then discard a card and put a plan counter on this enchantment.
When the fourth plan counter is put on this enchantment, sacrifice it. When you do, return up to two target instant and/or sorcery cards from your graveyard to your hand.
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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.
Unctus, Grand Metatect 81%
$0.37#3744
"Other blue creatures you control have "Whenever this creature becomes tapped, draw a card, then discard a card.""