Song of Blood 

Sorcery
Mill four cards. Whenever a creature attacks this turn, it gets +1/+0 until end of turn for each creature card put into your graveyard this way.
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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.
Picklock Prankster // Free the Fae 86%
$0.33#8027
"Mill four cards. Then put an instant, sorcery, or Faerie card from among the milled cards into your hand."
Cache Grab 84%
$0.27#4897
"Mill four cards. You may put a permanent card from among the cards milled this way into your hand. If you control a Squirrel or returned a Squirrel card to your hand this way, create a Food token."
Rapid Rescue 81%
$0.09#24464
"Mill two cards. You may put a permanent card from among the milled cards into your hand. You gain 2 life."