Sigiled Sentinel 
Creature — Human Knight
$0.08 #23995 0.00 3.4 years
Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn.)
Vigilance
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Cards similar to Sigiled Sentinel 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.
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$0.14↑#256250.42↑7.3 years↑
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$0.19↑#11053↑0.043.6 years
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$0.19↑#14503↑0.31↑6.4 years↑
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"Vigilance"
Serra's Guardian92%
$0.37↑#9099↑0.38↑8.1 years↑
"Vigilance"
Aang, Air Nomad92%
$0.31↑#12037↑0.000.8 years↓
"Vigilance"
Oathsworn Giant86%
$0.23↑#14600↑0.27↑20.9 years↑
"Vigilance"
Herald of Dromoka86%
$0.15↑#12909↑0.26↑11.4 years↑
"Vigilance"
Village Survivors86%
$0.05↓#31522↓0.38↑14.6 years↑
"Vigilance"
Maze Sentinel86%
$0.10↑#255040.0013.3 years↑
"Vigilance"
Observant Alseid82%
$0.08#213480.20↑12.9 years↑
"Vigilance"
Captain of the Watch81%
$0.36↑#3914↑0.13↑17.1 years↑
"Vigilance"
Haldir, Lórien Lieutenant80%
$0.30↑#6566↑0.003.2 years
"Vigilance"
Steadfast Sentry80%
$0.06↓#275360.48↑7.2 years↑
"Vigilance"
Loyal Unicorn80%
$0.31↑#6452↑0.48↑8.1 years↑
"Vigilance"
Embodiment of Insight80%
$0.24↑#7107↑0.15↑10.6 years↑
"Vigilance"
Commander Mustard80%
$0.95↑#11576↑0.27↑2.5 years
"Vigilance"
Redcap Heelslasher79%
$0.09↑#230910.29↑3.4 years
"Backup 1"
Inquisitor Greyfax79%
$0.35↑#9854↑0.063.9 years
"Vigilance"
Apothecary Stomper79%
$0.13↑#15887↑0.14↑1.8 years↓
"Vigilance"