Oathsworn Knight 
Creature — Human Knight
$0.19 #19424 0.24 6.9 years
This creature enters with four +1/+1 counters on it.
This creature attacks each combat if able.
If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove a +1/+1 counter from it.
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Cards similar to Oathsworn Knight 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.
Ugin's Conjurant98%
$0.19#11664↑0.257.3 years
"If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove that many +1/+1 counters from this creature."
+1 more matching line
Phantom Nomad96%
$0.21↑#26406↓0.00↓24.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Phantom Wurm96%
$0.14↓#23385↓0.43↑19.9 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Phantom Flock96%
$0.06↓#230530.00↓24.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Phantom Nantuko96%
$0.20↑#167760.00↓24.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Undergrowth Champion96%
$0.38↑#8301↑0.42↑10.9 years↑
"If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove a +1/+1 counter from this creature."
Protean Hydra95%
$4.51↑#6501↑0.1817.1 years↑
"If damage would be dealt to this creature, prevent that damage and remove that many +1/+1 counters from it."
+1 more matching line
Phantom Centaur95%
$0.13↓#27024↓0.56↑24.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Rock Hydra95%
$1.00↑#27606↓0.1933.1 years↑
"For each 1 damage that would be dealt to this creature, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage."
+1 more matching line
Phantom Tiger94%
$0.16↓#230110.06↓24.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Unbreathing Horde92%
$0.26↑#8314↑0.67↑14.9 years↑
"If this creature would be dealt damage, prevent that damage and remove a +1/+1 counter from it."
Phantom Nishoba90%
$0.25↑#14072↑0.1724.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Magma Pummeler90%
$0.21↑#199970.214.8 years↓
"This creature enters with X +1/+1 counters on it."
+1 more matching line
Bloodrock Cyclops88%
$0.05↓#30779↓0.12↓29.2 years↑
"This creature attacks each combat if able."
Riot Piker88%
$0.10↓#24687↓0.00↓13.3 years↑
"This creature attacks each combat if able."
Thran War Machine88%
$0.15↓#31532↓0.39↑27.6 years↑
"This creature attacks each combat if able."
Tectonic Fiend88%
$0.13↓#31436↓0.00↓19.9 years↑
"This creature attacks each combat if able."
Crazed Goblin88%
$0.08↓#227630.35↑22.6 years↑
"This creature attacks each combat if able."
Berserkers of Blood Ridge88%
$0.03↓#30293↓0.44↑17.1 years↑
"This creature attacks each combat if able."
Ashen Monstrosity88%
$0.31↑#28773↓0.60↑21.6 years↑
"This creature attacks each combat if able."