Iconic Shield 
Artifact — Equipment
Equipped creature gets +1/+2 and has "Whenever this creature attacks, another target attacking creature gains indestructible until end of turn." (Damage and effects that say "destroy" don't destroy it.)
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)
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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.
Dire Flail // Dire Blunderbuss 88%
$0.23#13626
"Equipped creature gets +3/+0 and has "Whenever this creature attacks, you may sacrifice an artifact other than Dire Blunderbuss. When you do, this creature deals damage equal to its power to target creature.""
Diamond Pick-Axe 80%
$1.35#1563
"Equipped creature gets +1/+1 and has "Whenever this creature attacks, create a Treasure token.""
+1 more matching line