Contractual Safeguard 
Instant
$2.49 #9620 0.73 4.5 years
Addendum — If you cast this spell during your main phase, put a shield counter on a creature you control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)
Choose a kind of counter on a creature you control. Put a counter of that kind on each other creature you control.
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Cards similar to Contractual Safeguard 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.
Brokers Veteran70%
$0.18↓#22155↓0.06↓4.5 years
"When this creature dies, put a shield counter on target creature you control."