Disciplined Duelist 
Creature — Human Citizen
$0.09 #22834 0.32 4.4 years
Double strike
This creature enters with a shield counter on it. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)
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Cards similar to Disciplined Duelist 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.
Dapper Shieldmate100%
$0.03↓#27641↓0.00↓4.4 years
"This creature enters with a shield counter on it."
Swooping Protector100%
$0.10↑#244790.244.4 years
"This creature enters with a shield counter on it."
Rhox Pummeler96%
$0.07↓#249340.00↓4.4 years
"This creature enters with a shield counter on it."
Voice of the Vermin94%
$0.12↑#27894↓0.00↓4.4 years
"This creature enters with a shield counter on it."
Wingshield Agent94%
$0.08↓#259960.06↓4.4 years
"This creature enters with a shield counter on it."
Rigo, Streetwise Mentor84%
$0.20↑#13908↑0.06↓4.4 years
"this card enters with a shield counter on it."
King T'Challa // Black Panther, Hope Enduring84%
$10.60↑#6792↑0.00↓0.2 years↓
"Double strike"
Diamond City83%
$3.79↑#3087↑0.20↓2.5 years↓
"This land enters with a shield counter on it."
Falco Spara, Pactweaver82%
$2.52↑#7017↑0.05↓4.4 years
"this card enters with a shield counter on it."
Captain America, Super-Soldier82%
$3.67↑#11252↑0.00↓0.2 years↓
"this card enters with a shield counter on him."
+1 more matching line
Undercover Operative80%
$0.37↑#5371↑0.324.4 years
"You may have this creature enter as a copy of any creature on the battlefield, except it enters with a shield counter on it if you control that creature."
Sanctuary Warden79%
$1.09↑#7818↑0.274.4 years
"This creature enters with two shield counters on it."
Fog Bank76%
$0.14↑#2734↑0.2627.9 years↑
"Defender"
Phantom Nomad76%
$0.21↑#264060.00↓24.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Phantom Wurm76%
$0.14↑#233850.43↑19.9 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Phantom Flock75%
$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."
Ugin's Conjurant74%
$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."
Phantom Nantuko74%
$0.20↑#16776↑0.00↓24.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Phantom Centaur72%
$0.13↑#270240.56↑24.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Ursine Fylgja72%
$0.21↑#262840.06↓20.1 years↑
"Remove a healing counter from this creature: Prevent the next 1 damage that would be dealt to this creature this turn."