Shield Broker 
Creature — Octopus Advisor
$0.19 #10450 0.40 4.4 years
When this creature enters, put a shield counter on target noncommander creature you don't control. You gain control of that creature for as long as it has 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 Shield Broker 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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"When this creature enters, gain control of target creature for as long as this creature remains on the battlefield."
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"When this card enters, put a shield counter on target creature."
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"Put a shield counter on target creature."
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"When this creature enters, gain control of target creature for as long as you control this creature."
Singer of Swift Rivers72%
$0.30↑#6034↑0.26↓2.8 years↓
"When this creature enters, put a shield counter on another target creature you control."
Brokers Veteran70%
$0.22↑#21816↓0.25↓4.4 years
"When this creature dies, put a shield counter on target creature you control."
Kros, Defense Contractor70%
$0.41↑#112860.444.4 years
"At the beginning of your upkeep, put a shield counter on target creature an opponent controls."