Kalonian Hydra 
Creature — Hydra
$5.87 #1120 0.45 13.1 years
Trample
This creature enters with four +1/+1 counters on it.
Whenever this creature attacks, double the number of +1/+1 counters on each creature you control.
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Cards similar to Kalonian Hydra 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.
Lily Bowen, Raging Grandma96%
$0.51↓#6967↓0.00↓2.5 years↓
"this card enters with two +1/+1 counters on it."
Mossborn Hydra95%
$12.69↑#777↑0.75↑1.8 years↓
"This creature enters with a +1/+1 counter on it."
Byrke, Long Ear of the Law93%
$6.85↑#5927↓0.29↓2.1 years↓
"Whenever a creature you control with a +1/+1 counter on it attacks, double the number of +1/+1 counters on it."
Hulk, Strongest There Is92%
$0.82↓#16769↓0.00↓0.2 years↓
"this card enters with a +1/+1 counter on him."
+1 more matching line
Kinetic Ooze90%
$0.29↓#7650↓0.00↓0.4 years↓
"This creature enters with X +1/+1 counters on it."
Sisterhood of Karn90%
$0.21↓#12120↓0.31↓2.9 years↓
"This creature enters with a +1/+1 counter on it."
Big Mother Mouser89%
$2.05↓#5279↓0.00↓0.5 years↓
"Whenever this creature attacks, double the number of +1/+1 counters on it."
+1 more matching line
Oran-Rief Ooze89%
$0.30↓#7852↓0.56↑5.9 years↓
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature with a +1/+1 counter on it."
+1 more matching line
Ascendant Acolyte88%
$0.34↓#10992↓0.06↓4.5 years↓
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Ornery Tumblewagg88%
$0.34↓#4990↓0.90↑2.4 years↓
"Whenever this creature attacks while saddled, double the number of +1/+1 counters on target creature."
Primordial Hydra87%
$1.39↓#2463↓0.4515.1 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Voracious Hydra87%
$0.28↓#2738↓0.29↓7.2 years↓
"This creature enters with X +1/+1 counters on it."
+2 more matching lines
Bristly Bill, Spine Sower86%
$38.87↑#9230.96↑2.4 years↓
": Double the number of +1/+1 counters on each creature you control."
: Double the number of +1/+1 counters on each creature you control."
Botanical Brawler85%
$0.32↓#6758↓0.27↓3.4 years↓
"This creature enters with two +1/+1 counters on it."
+2 more matching lines
Seismic Tutelage83%
$0.88↓#11409↓0.00↓0.8 years↓
"Whenever enchanted creature attacks, double the number of +1/+1 counters on it."
Fractal Harness82%
$0.30↓#6428↓0.07↓5.4 years↓
"Whenever equipped creature attacks, double the number of +1/+1 counters on it."
+1 more matching line
The Thing82%
$0.34↓#16114↓0.00↓0.2 years↓
"Whenever this card attacks, you may pay 
. When you do, double the number of each kind of counter on any number of target permanents you control."
. When you do, double the number of each kind of counter on any number of target permanents you control."+1 more matching line
Sovereign Okinec Ahau82%
$3.25↓#2821↓0.412.8 years↓
"Whenever this card attacks, for each creature you control with power greater than that creature's base power, put a number of +1/+1 counters on that creature equal to the difference."
Court of Garenbrig82%
$16.53↑#2224↓0.403.0 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."
Hydra's Growth82%
$1.08↓#2107↓0.34↓6.6 years↓
"At the beginning of your upkeep, double the number of +1/+1 counters on enchanted creature."