Gelid Shackles {W}
Snow Enchantment — Aura
Enchant creature
Enchanted creature can't block, and its activated abilities can't be activated.
{S}: Enchanted creature gains defender until end of turn. ({S} can be paid with one mana from a snow source.)
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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.
Demotion 100%
$0.17#15298
"Enchanted creature can't block, and its activated abilities can't be activated."
Kirtar's Desire 88%
$0.22#25863
"Enchanted creature can't block as long as there are seven or more cards in your graveyard."
+1 more matching line
Awesome Presence 86%
$0.22#18662
"Enchanted creature can't be blocked unless defending player pays {3} for each creature they control that's blocking it."
+1 more matching line
Ironclaw Curse 83%
$0.32#30818
"Enchanted creature can't block creatures with power equal to or greater than the enchanted creature's toughness."
+1 more matching line
Protective Bubble 81%
$0.34#12667
"Enchanted creature can't be blocked and has shroud."
+1 more matching line