Oblivion Crown 

Enchantment — Aura
$0.30 #12497 0.50 19.3 years
Flash (You may cast this spell any time you could cast an instant.)
Enchant creature
Enchanted creature has "Discard a card: This creature gets +1/+1 until end of turn."
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Cards similar to Oblivion Crown 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.
Noose Constrictor86%
$0.10↓#112350.08↓10.1 years↓
"Discard a card: This creature gets +1/+1 until end of turn."
Psychatog86%
$6.41↑#18802↓0.00↓24.9 years↑
"Discard a card: This creature gets +1/+1 until end of turn."
Phantatog82%
$0.29↓#20110↓0.62↑24.9 years↑
"Discard a card: This creature gets +1/+1 until end of turn."
Tireless Tribe82%
$0.89↑#104550.38↓24.9 years↑
"Discard a card: This creature gets +0/+4 until end of turn."
Hell Mongrel81%
$0.30#142430.17↓5.2 years↓
"Discard a card: This creature gets +1/+1 until end of turn."
Vampire Hounds77%
$0.12↓#29765↓0.00↓28.2 years↑
"Discard a creature card: This creature gets +2/+2 until end of turn."
Skyshroud Vampire77%
$0.19↓#30916↓0.22↓28.9 years↑
"Discard a creature card: This creature gets +2/+2 until end of turn."
Erebos's Emissary75%
$0.16↓#23647↓0.24↓12.9 years↓
"Discard a creature card: This creature gets +2/+2 until end of turn. If this permanent is an Aura, enchanted creature gets +2/+2 until end of turn instead."
Immobilizing Ink73%
$0.10↓#25841↓0.33↓24.9 years↑
"Enchanted creature has "
, Discard a card: Untap this creature.""
+1 more matching line
Simian Brawler72%
$0.09↓#25658↓0.05↓20.1 years
"Discard a land card: This creature gets +1/+1 until end of turn."
Midnight Covenant72%
$0.08↓#27686↓0.00↓21.9 years↑
"Enchanted creature has "
: This creature gets +1/+1 until end of turn.""