Kithkin Armor 
Enchantment — Aura
$0.13 #20752 0.47 29.4 years
Enchant creature
Enchanted creature can't be blocked by creatures with power 3 or greater.
Sacrifice this Aura: The next time a source of your choice would deal damage to enchanted creature this turn, prevent that damage.
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Cards similar to Kithkin Armor 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.
Cheeky House-Mouse // Squeak By83%
$0.31↑#10599↑0.27↓3.1 years↓
"Target creature you control gets +1/+1 until end of turn. It can't be blocked by creatures with power 3 or greater this turn."
Inviolability80%
$0.26↑#193980.31↓27.0 years↓
"Prevent all damage that would be dealt to enchanted creature."
+1 more matching line
Delney, Streetwise Lookout79%
$34.24↑#853↑0.89↑2.7 years↓
"Creatures you control with power 2 or less can't be blocked by creatures with power 3 or greater."
Samite Censer-Bearer76%
$0.15↑#30415↓0.13↓19.5 years↓
"
, Sacrifice this creature: Prevent the next 1 damage that would be dealt to each creature you control this turn."
Fleet-Footed Monk74%
$0.17↑#30309↓0.07↓29.5 years
"This creature can't be blocked by creatures with power 2 or greater."
Hedgewitch's Mask72%
$0.22↑#14830↑0.27↓5.1 years↓
"Equipped creature can't be blocked by creatures with power 4 or greater."
Bubble Matrix72%
$11.27↑#188360.77↑29.4 years
"Prevent all damage that would be dealt to creatures."
Fylgja71%
$0.16↑#30086↓0.00↓31.4 years↑
"Remove a healing counter from this Aura: Prevent the next 1 damage that would be dealt to enchanted creature this turn."
Duskmantle Operative71%
$0.10↓#248980.12↓7.5 years↓
"This creature can't be blocked by creatures with power 4 or greater."
Goldmeadow Dodger71%
$0.23↑#243770.00↓19.0 years↓
"This creature can't be blocked by creatures with power 4 or greater."
Samite Blessing70%
$0.15↑#25445↓0.26↓28.6 years
"Enchanted creature has "
: The next time a source of your choice would deal damage to target creature this turn, prevent that damage.""
+1 more matching line
Prismatic Ward70%
$0.12↓#26765↓0.25↓31.4 years↑
"Prevent all damage that would be dealt to enchanted creature by sources of the chosen color."
+1 more matching line
Muzzle70%
$0.13#28097↓0.3727.0 years↓
"Prevent all damage that would be dealt by enchanted creature."
Heart of Light70%
$0.10↓#25985↓0.20↓21.7 years↓
"Prevent all damage that would be dealt to and dealt by enchanted creature."
Goblin Furrier70%
$0.09↓#31823↓0.00↓20.2 years↓
"Prevent all damage that this creature would deal to snow creatures."
Light of Sanction70%
$0.42↑#236780.06↓21.0 years↓
"Prevent all damage that would be dealt to creatures you control by sources you control."