Bloatfly Swarm 

Creature — Insect Mutant
Flying
This creature enters with five +1/+1 counters on it.
If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage, remove that many +1/+1 counters from it, then give each player a rad counter for each +1/+1 counter removed this way.
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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.
Noosegraf Mob 100%
$0.40#10512
"This creature enters with five +1/+1 counters on it."
+1 more matching line
Phantom Nishoba 92%
$0.32#13801
"This creature enters with seven +1/+1 counters on it."
+1 more matching line
Workhorse 91%
$2.65#13041
"This creature enters with four +1/+1 counters on it."
+1 more matching line
Phantom Wurm 91%
$0.24#22906
"This creature enters with four +1/+1 counters on it."
+1 more matching line
Oathsworn Knight 91%
$0.31#18953
"This creature enters with four +1/+1 counters on it."
+1 more matching line