Bloatfly Swarm 
Creature — Insect Mutant
$1.73 #5401 0.73 2.6 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%
$4.24↑#6637↓0.52↓17.3 years↑
"This creature enters with X +1/+1 counters on it."
+1 more matching line
Phantom Flock96%
$0.04↓#23361↓0.00↓24.4 years↑
"This creature enters with three +1/+1 counters on it."
+1 more matching line
Ugin's Conjurant95%
$0.16↓#11908↓0.07↓7.5 years↑
"This creature enters with X +1/+1 counters on it."
+1 more matching line
Phantom Tiger95%
$0.11↓#23451↓0.00↓24.4 years↑
"This creature enters with two +1/+1 counters on it."
+1 more matching line
Phantom Nomad95%
$0.24↓#26712↓0.00↓24.4 years↑
"This creature enters with two +1/+1 counters on it."
+1 more matching line
Phantom Wurm95%
$0.13↓#23839↓0.12↓20.0 years↑
"This creature enters with four +1/+1 counters on it."
+1 more matching line
Phantom Nantuko94%
$0.21↓#17191↓0.11↓24.4 years↑
"This creature enters with two +1/+1 counters on it."
+1 more matching line
Rock Hydra93%
$1.00↓#27908↓0.62↓33.2 years↑
"This creature enters with X +1/+1 counters on it."
+1 more matching line
Phantom Centaur93%
$0.15↓#27284↓0.17↓24.4 years↑
"This creature enters with three +1/+1 counters on it."
+1 more matching line
Oathsworn Knight92%
$0.19↓#19708↓0.20↓7.0 years↑
"This creature enters with four +1/+1 counters on it."
+1 more matching line
Magma Pummeler86%
$0.23↓#20430↓0.06↓4.9 years↑
"This creature enters with X +1/+1 counters on it."
+1 more matching line
Phantom Nishoba86%
$0.25↓#14448↓0.06↓24.4 years↑
"This creature enters with seven +1/+1 counters on it."
+1 more matching line
Undergrowth Champion86%
$0.38↓#8504↓0.00↓11.0 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."
Sekki, Seasons' Guide85%
$1.59↓#18616↓0.24↓21.4 years↑
"this card enters with eight +1/+1 counters on it."
+1 more matching line
Balduvian Hydra83%
$1.17↓#29763↓0.10↓31.4 years↑
"This creature enters with X +1/+0 counters on it."
+1 more matching line
Unbreathing Horde82%
$0.27↓#8318↓0.19↓15.1 years↑
"If this creature would be dealt damage, prevent that damage and remove a +1/+1 counter from it."
Botanical Brawler80%
$0.26↓#6899↓0.06↓3.5 years
"This creature enters with two +1/+1 counters on it."
+1 more matching line
Maga, Traitor to Mortals80%
$3.10↑#20494↓0.50↓21.4 years↑
"this card enters with X +1/+1 counters on it."
Polukranos, Unchained79%
$0.74↓#12145↓0.12↓6.7 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
Slurrk, All-Ingesting76%
$0.29↓#9684↓0.11↓5.9 years↑
"this card enters with five +1/+1 counters on it."