Kithkin Armor 
Enchantment — Aura
$0.13 #20421 0.38 29.2 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%
$0.32↑#10453↑0.00↓3.0 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%
$0.20↑#193660.16↓26.9 years↓
"Prevent all damage that would be dealt to enchanted creature."
Delney, Streetwise Lookout79%
$33.71↑#839↑0.81↑2.6 years↓
"Creatures you control with power 2 or less can't be blocked by creatures with power 3 or greater."
Samite Censer-Bearer76%
$0.12↓#30074↓0.00↓19.3 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↑#29931↓0.00↓29.3 years
"This creature can't be blocked by creatures with power 2 or greater."
Hedgewitch's Mask72%
$0.21↑#14559↑0.27↓4.9 years↓
"Equipped creature can't be blocked by creatures with power 4 or greater."
Bubble Matrix72%
$11.59↑#189360.89↑29.2 years
"Prevent all damage that would be dealt to creatures."
Fylgja71%
$0.15↑#29801↓0.71↑31.3 years↑
"Remove a healing counter from this Aura: Prevent the next 1 damage that would be dealt to enchanted creature this turn."
+1 more matching line
Goldmeadow Dodger71%
$0.21↑#240820.00↓18.9 years↓
"This creature can't be blocked by creatures with power 4 or greater."
Duskmantle Operative71%
$0.05↓#24547↓0.53↑7.3 years↓
"This creature can't be blocked by creatures with power 4 or greater."
Shielded Passage71%
$0.04↓#211080.3613.6 years↓
"Prevent all damage that would be dealt to target creature this turn."
Samite Blessing70%
$0.19↑#25177↓0.60↑28.5 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%
$0.10↓#26472↓0.73↑31.3 years↑
"Prevent all damage that would be dealt to enchanted creature by sources of the chosen color."
+1 more matching line
Muzzle70%
$0.12↓#27851↓0.15↓26.9 years↓
"Prevent all damage that would be dealt by enchanted creature."
Heart of Light70%
$0.08↓#25888↓0.06↓21.6 years↓
"Prevent all damage that would be dealt to and dealt by enchanted creature."
Goblin Furrier70%
$0.09↓#31418↓0.2920.1 years↓
"Prevent all damage that this creature would deal to snow creatures."