Forfend 

Instant
Prevent all damage that would be dealt to creatures this turn.
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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.
Blinding Fog 98%
$0.15#10449
"Prevent all damage that would be dealt to creatures this turn. Creatures you control gain hexproof until end of turn."
Chant of Vitu-Ghazi 96%
$0.27#12097
"Prevent all damage that would be dealt by creatures this turn. You gain life equal to the damage prevented this way."
Crystal Fragments // Summon: Alexander 91%
$0.18#7674
"Prevent all damage that would be dealt to creatures you control this turn."
Safe Passage 83%
$0.16#10745
"Prevent all damage that would be dealt to you and creatures you control this turn."
Eerie Interference 82%
$0.21#8947
"Prevent all damage that would be dealt to you and creatures you control this turn by creatures."
Endure 81%
$0.14#26800
"Prevent all damage that would be dealt to you and permanents you control this turn."