Hydra's Growth 
Enchantment — Aura
$1.23 #2156 0.34 6.7 years
Enchant creature
When this Aura enters, put a +1/+1 counter on enchanted creature.
At the beginning of your upkeep, double the number of +1/+1 counters on enchanted creature.
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Cards similar to Hydra's Growth 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.
Seismic Tutelage98%
$0.90↓#11095↓0.310.9 years↓
"When this Aura enters, put a +1/+1 counter on enchanted creature."
+1 more matching line
Level Up95%
$1.70↑#3963↓0.60↑0.6 years↓
"When this Aura enters, put a +1/+1 counter on enchanted creature."
+2 more matching lines
Ascendant Acolyte90%
$0.32↓#11286↓0.294.7 years↓
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Primordial Hydra89%
$1.37↑#24290.55↑15.3 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Lily Bowen, Raging Grandma86%
$0.46↓#7080↓0.252.6 years↓
"this card enters with two +1/+1 counters on it."
+1 more matching line
Mossborn Hydra86%
$13.45↑#747↑0.95↑1.9 years↓
"This creature enters with a +1/+1 counter on it."
Fractal Harness84%
$0.25↓#6379↓0.295.5 years↓
"Whenever equipped creature attacks, double the number of +1/+1 counters on it."
+1 more matching line
Kalonian Hydra82%
$6.14↑#1136↑0.48↑13.3 years↑
"This creature enters with four +1/+1 counters on it."
+1 more matching line
Byrke, Long Ear of the Law82%
$7.22↑#6029↓0.14↓2.2 years↓
"Whenever a creature you control with a +1/+1 counter on it attacks, double the number of +1/+1 counters on it."
Sisterhood of Karn82%
$0.23↓#12410↓0.373.0 years↓
"This creature enters with a +1/+1 counter on it."
+1 more matching line
Ornery Tumblewagg82%
$0.36↓#5181↓0.22↓2.5 years↓
"At the beginning of combat on your turn, put a +1/+1 counter on target creature."
Bristly Bill, Spine Sower81%
$24.37↑#918↑1.00↑2.5 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."
Solarion81%
$0.63↓#22379↓0.21↓22.4 years↑
"
: Double the number of +1/+1 counters on this creature."
: Double the number of +1/+1 counters on this creature."
Forced Adaptation80%
$0.14↓#8490↓0.00↓13.7 years↑
"At the beginning of your upkeep, put a +1/+1 counter on enchanted creature."
Corpsejack Menace80%
$0.33↓#1570↑0.3014.0 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."
Sage of the Fang80%
$0.19↓#14607↓0.07↓1.5 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Branching Evolution80%
$6.88↑#376↑0.58↑6.3 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."
Sword of Hours79%
$5.43↑#5102↓0.00↓5.2 years↓
"Whenever equipped creature attacks, put a +1/+1 counter on it."
Court of Garenbrig78%
$13.94↑#23020.383.1 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."
Hulk, Strongest There Is78%
$0.92↓#15836↓0.47↑0.3 years↓
"At the beginning of your upkeep, double the number of +1/+1 counters on each Gamma creature you control."
+1 more matching line