False Orders 
Instant
Cast this spell only during the declare blockers step.
Remove target creature defending player controls from combat. Creatures it was blocking that had become blocked by only that creature this combat become unblocked. You may have it block an attacking creature of your choice.
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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.
Mirror Match 100%
$0.38#16751
"Cast this spell only during the declare blockers step."
+1 more matching line
Illusionist's Gambit 95%
$0.44#3736
"Cast this spell only during the declare blockers step on an opponent's turn."
Flash Foliage 88%
$0.27#19224
"Cast this spell only during combat after blockers are declared."
+1 more matching line
Melee 87%
$0.33#28941
"Cast this spell only during combat on your turn before blockers are declared."
+1 more matching line
Blaze of Glory 86%
#24208
"Cast this spell only during combat before blockers are declared."
+1 more matching line
Panic 86%
#16225
"Cast this spell only during combat before blockers are declared."
+1 more matching line