Disciplined Duelist 
Creature — Human Citizen
$0.11 #23195 0.12 4.5 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%
$0.04↓#28077↓0.00↓4.5 years
"This creature enters with a shield counter on it."
Swooping Protector100%
$0.04↓#248080.064.5 years
"This creature enters with a shield counter on it."
Rhox Pummeler96%
$0.06↓#253150.214.5 years
"This creature enters with a shield counter on it."
Voice of the Vermin94%
$0.15↑#28215↓0.144.5 years
"This creature enters with a shield counter on it."
Wingshield Agent90%
$0.07↓#264240.124.5 years
"This creature enters with a shield counter on it."
Rigo, Streetwise Mentor83%
$0.25↑#14274↑0.00↓4.5 years
"this card enters with a shield counter on it."
Falco Spara, Pactweaver82%
$2.50↑#7108↑0.31↑4.5 years
"this card enters with a shield counter on it."
Diamond City82%
$2.92↑#3170↑0.28↑2.6 years↓
"This land enters with a shield counter on it."
Captain America, Super-Soldier82%
$2.69↑#10368↑0.40↑0.3 years↓
"this card enters with a shield counter on him."
+1 more matching line
King T'Challa // Black Panther, Hope Enduring82%
$7.01↑#5445↑0.71↑0.3 years↓
"Double strike"
Undercover Operative80%
$0.36↑#5464↑0.53↑4.5 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%
$1.33↑#7846↑0.00↓4.5 years
"This creature enters with two shield counters on it."
Perrie, the Pulverizer77%
$0.20↑#16772↑0.33↑4.5 years
"When this card enters, put a shield counter on target creature."
Phantom Nomad76%
$0.24↑#267120.00↓24.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Phantom Wurm76%
$0.13↑#238390.1220.0 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Phantom Tiger76%
$0.11#234510.00↓24.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Phantom Flock75%
$0.04↓#233610.00↓24.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Ugin's Conjurant74%
$0.16↑#11908↑0.077.5 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%
$0.21↑#17191↑0.1124.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Ironscale Hydra72%
$0.43↑#9094↑0.67↑6.7 years↑
"If a creature would deal combat damage to this creature, prevent that damage and put a +1/+1 counter on this creature."