Cloak of Confusion 
Enchantment — Aura
$0.15 #27906 0.00 31.3 years
Enchant creature you control
Whenever enchanted creature attacks and isn't blocked, you may have it assign no combat damage this turn. If you do, defending player discards a card at random.
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Cards similar to Cloak of Confusion 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.
Abyssal Nightstalker83%
$0.49↑#275910.27↑28.2 years↓
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Mindstab Thrull76%
$0.14↓#269250.27↑31.8 years
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Aspect of Lamprey74%
$0.11↓#17446↑0.076.6 years↓
"Enchant creature you control"
Soul Ransom74%
$0.14↓#20466↑0.27↑13.6 years↓
"You control enchanted creature."
Farrel's Mantle72%
$0.23↑#291010.11↑31.8 years
"Whenever enchanted creature attacks and isn't blocked, its controller may have it deal damage equal to its power plus 2 to another target creature. If that player does, the attacking creature assigns no combat damage this turn."
Keeper of Tresserhorn72%
$0.64↑#314580.25↑30.2 years↓
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Dauthi Mindripper72%
$0.28↑#229220.33↑28.9 years↓
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Mind Knives72%
$0.20↑#302590.50↑29.3 years↓
"Target opponent discards a card at random."
Stupor72%
$0.12↓#254880.60↑29.9 years↓
"Target opponent discards a card at random, then discards a card."
Strands of Undeath70%
$0.18↑#21598↑0.28↑20.9 years↓
"Enchant creature"