Guard Duty 
Enchantment — Aura
$0.08 #22451 0.14 16.4 years
Enchant creature
Enchanted creature has defender.
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Cards similar to Guard Duty 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.
Candletrap95%
$0.21↑#17162↑0.73↑4.9 years↓
"Enchanted creature has defender."
Zephyr Net94%
$0.18↑#29012↓0.29↑18.9 years↑
"Enchanted creature has defender and flying."
Stasis Field90%
$0.22↑#13414↑0.27↑3.4 years↓
"Enchanted creature has base power and toughness 0/2, has defender, and loses all other abilities."
+1 more matching line
Sky Tether88%
$0.06↓#225720.33↑7.6 years↓
"Enchanted creature has defender and loses flying."
Gelid Shackles88%
$0.30↑#16810↑0.0620.1 years↑
"
: Enchanted creature gains defender until end of turn."
: Enchanted creature gains defender until end of turn."
Eland Umbra84%
$0.36↑#11247↑0.0616.4 years
"Enchant creature"
Goblin War Paint84%
$0.07↓#17924↑0.2216.9 years
"Enchant creature"
Primal Frenzy84%
$0.16↑#233250.33↑24.9 years↑
"Enchant creature"
Lightning Talons82%
$0.06↓#215570.0717.9 years↑
"Enchant creature"
Candlelight Vigil82%
$0.12↑#192020.00↓7.9 years↓
"Enchant creature"
Marked by Honor82%
$0.05↓#226040.2212.1 years↓
"Enchant creature"
Spider-Man No More82%
$0.19↑#8123↑0.51↑1.0 years↓
"Enchanted creature is a Citizen with base power and toughness 1/1. It has defender and loses all other abilities."
Deep Freeze82%
$0.20↑#180390.53↑8.4 years↓
"Enchanted creature has base power and toughness 0/4, has defender, loses all other abilities, and is a blue Wall in addition to its other colors and types."
+1 more matching line
Giant Spectacle82%
$0.04↓#202130.36↑9.9 years↓
"Enchant creature"
Imposing Visage82%
$0.15↑#244840.43↑31.3 years↑
"Enchant creature"
Messenger's Speed82%
$0.18↑#13210↑0.2112.9 years↓
"Enchant creature"
Boar Umbra81%
$0.26↑#7832↑0.0516.4 years
"Enchant creature"
Mark of the Vampire81%
$0.12↑#15448↑0.00↓14.1 years↓
"Enchant creature"
Mythic Proportions80%
$0.54↑#229300.38↑23.9 years↑
"Enchant creature"
Fog on the Barrow-Downs80%
$0.16↑#17864↑0.44↑3.2 years↓
"Enchant creature"