Iron-Shield Elf {1}{B}
Creature — Elf Warrior
Discard a card: This creature gains indestructible until end of turn. Tap it. (Damage and effects that say "destroy" don't destroy it. If its toughness is 0 or less, it still dies.)
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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.
Guardian of New Benalia 100%
$0.30#16431
"Discard a card: This creature gains indestructible until end of turn. Tap it."
Prognostic Sphinx 99%
$0.31#10185
"Discard a card: This creature gains hexproof until end of turn. Tap it."
Dream Trawler 99%
$0.70#6556
"Discard a card: This creature gains hexproof until end of turn. Tap it."
Witch-king of Angmar 99%
$8.19#2809
"Discard a card: this card gains indestructible until end of turn. Tap it."
Seasoned Hallowblade 86%
$0.25#18742
"Discard a card: Tap this creature. It gains indestructible until end of turn."