Dragon Mantle 
Enchantment — Aura
Enchant creature
When this Aura enters, draw a card.
Enchanted creature has "{R}: This creature gets +1/+0 until end of turn."
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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.
Ghitu Firebreathing 84%
$0.15#18912
"{R}: Enchanted creature gets +1/+0 until end of turn."
+1 more matching line
Keldon Mantle 84%
$0.18#28874
"{R}: Enchanted creature gets +1/+0 until end of turn."
+1 more matching line
Fiery Mantle 84%
$0.17#19856
"{R}: Enchanted creature gets +1/+0 until end of turn."
+1 more matching line
Crown of Flames 84%
$0.29#13893
"{R}: Enchanted creature gets +1/+0 until end of turn."
+1 more matching line