Sparring Regimen 
Enchantment
$0.26 #17723 0.15 5.5 years
When this enchantment enters, learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)
Whenever you attack, put a +1/+1 counter on target attacking creature and untap it.
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Cards similar to Sparring Regimen 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.
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+1 more matching line
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"Whenever this creature attacks, untap target creature you control."
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"Whenever this creature attacks, untap another target creature you control."