Bloatfly Swarm 
Creature — Insect Mutant
$4.20 #5305 0.45 2.5 years
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 similar to Bloatfly Swarm 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.
Protean Hydra96%
$4.51↑#6501↓0.18↓17.1 years↑
"This creature enters with X +1/+1 counters on it."
+1 more matching line
Ugin's Conjurant96%
$0.19↓#11664↓0.25↓7.3 years↑
"This creature enters with X +1/+1 counters on it."
+1 more matching line
Phantom Nomad96%
$0.21↓#26406↓0.00↓24.3 years↑
"This creature enters with two +1/+1 counters on it."
+1 more matching line
Phantom Wurm96%
$0.14↓#23385↓0.4319.9 years↑
"This creature enters with four +1/+1 counters on it."
+1 more matching line
Phantom Flock96%
$0.06↓#23053↓0.00↓24.3 years↑
"This creature enters with three +1/+1 counters on it."
+1 more matching line
Phantom Nantuko94%
$0.20↓#16776↓0.00↓24.3 years↑
"This creature enters with two +1/+1 counters on it."
+1 more matching line
Rock Hydra93%
$1.00↓#27606↓0.19↓33.1 years↑
"This creature enters with X +1/+1 counters on it."
+1 more matching line
Phantom Centaur93%
$0.13↓#27024↓0.56↑24.3 years↑
"This creature enters with three +1/+1 counters on it."
+1 more matching line
Oathsworn Knight92%
$0.19↓#19424↓0.24↓6.9 years↑
"This creature enters with four +1/+1 counters on it."
+1 more matching line
Phantom Tiger91%
$0.16↓#23011↓0.06↓24.3 years↑
"This creature enters with two +1/+1 counters on it."
+1 more matching line
Magma Pummeler86%
$0.21↓#19997↓0.21↓4.8 years↑
"This creature enters with X +1/+1 counters on it."
+1 more matching line
Phantom Nishoba86%
$0.25↓#14072↓0.17↓24.3 years↑
"This creature enters with seven +1/+1 counters on it."
+1 more matching line
Undergrowth Champion86%
$0.38↓#8301↓0.4210.9 years↑
"If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove a +1/+1 counter from this creature."
Eye Collector86%
$0.16↓#10324↓0.06↓6.9 years↑
"Flying"
Sekki, Seasons' Guide85%
$1.61↓#18327↓0.27↓21.3 years↑
"this card enters with eight +1/+1 counters on it."
+1 more matching line
Balduvian Hydra83%
$1.13↓#29358↓0.00↓31.3 years↑
"This creature enters with X +1/+0 counters on it."
+1 more matching line
Unbreathing Horde82%
$0.26↓#8314↓0.67↑14.9 years↑
"If this creature would be dealt damage, prevent that damage and remove a +1/+1 counter from it."
Botanical Brawler80%
$0.32↓#6758↓0.27↓3.4 years
"This creature enters with two +1/+1 counters on it."
+1 more matching line
Maga, Traitor to Mortals80%
$3.05↓#20136↓0.07↓21.3 years↑
"this card enters with X +1/+1 counters on it."
Polukranos, Unchained80%
$0.74↓#11827↓0.29↓6.6 years↑
"If damage would be dealt to this card while it has a +1/+1 counter on it, prevent that damage and remove that many +1/+1 counters from it."
+1 more matching line