Fangs of Kalonia 

Sorcery
$0.34 #2507 0.25 2.2 years
Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on each creature that had a +1/+1 counter put on it this way.
Overload 

(You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")
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Cards similar to Fangs of Kalonia 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.
Biogenic Upgrade90%
$0.12↓#8980↓0.43↑7.6 years↑
"Distribute three +1/+1 counters among one, two, or three target creatures, then double the number of +1/+1 counters on each of those creatures."
Solidarity of Heroes89%
$0.65↑#6186↓0.1812.3 years↑
"Choose any number of target creatures. Double the number of +1/+1 counters on each of them."
+1 more matching line
Lifecrafter's Gift88%
$0.06↓#15832↓0.11↓9.6 years↑
"Put a +1/+1 counter on target creature, then put a +1/+1 counter on each creature you control with a +1/+1 counter on it."
Invigorating Surge87%
$0.24↓#3540↓0.216.2 years↑
"Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature."
Study the Classics87%
$0.27↓#15761↓0.00↓0.5 years↓
"Put a +1/+1 counter on target creature, then double the number of +1/+1 counters on it. You gain life equal to the number of +1/+1 counters on that creature."
Branching Evolution86%
$6.36↑#370↑0.44↑6.1 years↑
"If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead."
Growth Curve86%
$0.27↓#10370↓0.00↓0.4 years↓
"Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature."
Corpsejack Menace86%
$0.36↑#1552↑0.3513.9 years↑
"If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on it instead."
Deepglow Skate84%
$0.29↓#1840↑0.48↑9.8 years↑
"When this creature enters, double the number of each kind of counter on any number of target permanents."
Twisted Spider-Clone83%
$0.26↓#17113↓0.48↑0.9 years↓
"When this creature enters, put a +1/+1 counter on each creature you control with a +1/+1 counter on it."
Visions of Dominance82%
$0.77↑#7759↓0.13↓4.9 years↑
"Put a +1/+1 counter on target creature, then double the number of +1/+1 counters on it."
Patron of the Valiant82%
$0.10↓#15044↓0.38↑11.1 years↑
"When this creature enters, put a +1/+1 counter on each creature you control with a +1/+1 counter on it."
Byrke, Long Ear of the Law81%
$6.85↑#5927↓0.292.1 years
"Whenever a creature you control with a +1/+1 counter on it attacks, double the number of +1/+1 counters on it."
Court of Garenbrig80%
$16.53↑#22240.40↑3.0 years
"At the beginning of your upkeep, distribute two +1/+1 counters among up to two target creatures. Then if you're the monarch, double the number of +1/+1 counters on each creature you control."
Shang-Chi, Martial Mentor80%
$0.61↑#18357↓0.00↓0.2 years↓
"If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead."
Bristly Bill, Spine Sower80%
$38.87↑#923↑0.96↑2.4 years
"

: Double the number of +1/+1 counters on each creature you control."
Kalonian Hydra80%
$5.87↑#1120↑0.45↑13.1 years↑
"Whenever this creature attacks, double the number of +1/+1 counters on each creature you control."
The Earth Crystal78%
$13.76↑#723↑0.42↑1.2 years
"If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead."
Generous Pup78%
$7.08↑#5565↓0.171.8 years
"Whenever one or more +1/+1 counters are put on this creature, put a +1/+1 counter on each other creature you control. This ability triggers only once each turn."