Circle of Protection: Black 

Enchantment
{1}: The next time a black source of your choice would deal damage to you this turn, prevent that damage.
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Cards that do something similar 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.
Prismatic Circle 84%
$0.09#29784
"{1}: The next time a source of your choice of the chosen color would deal damage to you this turn, prevent that damage."
Circle of Protection: Blue 83%
$0.16#21620
"{1}: The next time a blue source of your choice would deal damage to you this turn, prevent that damage."