Blood Frenzy 

Instant
Cast this spell only before the combat damage step.
Target attacking or blocking creature gets +4/+0 until end of turn. Destroy that creature at the beginning of the next end step.
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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.
Siren's Call 84%
$0.19#21554
"Cast this spell only during an opponent's turn, before attackers are declared."
Rally the Troops 84%
$11.18#26559
"Cast this spell only during the declare attackers step and only if you've been attacked this step."
Warrior's Stand 84%
$10.88#30153
"Cast this spell only during the declare attackers step and only if you've been attacked this step."
Scorching Winds 84%
$0.24#28959
"Cast this spell only during the declare attackers step and only if you've been attacked this step."
Deep Wood 84%
$0.47#24372
"Cast this spell only during the declare attackers step and only if you've been attacked this step."
Heavy Fog 84%
#24306
"Cast this spell only during the declare attackers step and only if you've been attacked this step."
Eightfold Maze 84%
#30188
"Cast this spell only during the declare attackers step and only if you've been attacked this step."