Mossborn Hydra 
Creature — Elemental Hydra
$12.69 #777 0.75 1.8 years
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
This creature enters with a +1/+1 counter on it.
Landfall — Whenever a land you control enters, double the number of +1/+1 counters on this creature.
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Cards similar to Mossborn 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 Grandma97%
$0.51↓#6967↓0.00↓2.5 years
"this card enters with two +1/+1 counters on it."
Kalonian Hydra95%
$5.87↓#1120↓0.45↓13.1 years↑
"This creature enters with four +1/+1 counters on it."
+1 more matching line
Sisterhood of Karn92%
$0.21↓#12120↓0.31↓2.9 years↑
"This creature enters with a +1/+1 counter on it."
Bristly Bill, Spine Sower91%
$38.87↑#9230.96↑2.4 years
"Whenever a land you control enters, put a +1/+1 counter on target creature."
Scythecat Cub90%
$25.02↑#2878↓0.661.8 years
"Whenever a land you control enters, put a +1/+1 counter on target creature you control. If this is the second time this ability has resolved this turn, double the number of +1/+1 counters on that creature instead."
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
Territorial Scythecat88%
$0.16↓#7958↓0.38↓5.9 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
+1 more matching line
Vinelasher Kudzu88%
$0.34↓#13232↓0.56↓20.9 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Sazh's Chocobo88%
$1.12↓#3068↓0.37↓1.2 years
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Prowling Felidar88%
$0.18↓#14068↓0.675.9 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Primordial Hydra87%
$1.39↓#2463↓0.45↓15.1 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Murasa Ranger84%
$0.07↓#26866↓0.40↓10.9 years↑
"Whenever a land you control enters, you may pay 
. If you do, put two +1/+1 counters on this creature."
. If you do, put two +1/+1 counters on this creature."
Fractal Harness84%
$0.30↓#6428↓0.07↓5.4 years↑
"When this Equipment enters, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it and attach this Equipment to it."
The Thing82%
$0.34↓#16114↓0.00↓0.2 years↓
"Trample"
Solarion82%
$0.67↓#22258↓0.00↓22.3 years↑
"
: Double the number of +1/+1 counters on this creature."
: Double the number of +1/+1 counters on this creature."
Swarm Shambler82%
$0.19↓#15078↓0.26↓5.9 years↑
"This creature enters with a +1/+1 counter on it."
Slurrk, All-Ingesting82%
$0.29↓#9671↓0.41↓5.8 years↑
"this card enters with five +1/+1 counters on it."
Sage of the Fang82%
$0.22↓#14565↓0.11↓1.4 years
"When this creature enters, put a +1/+1 counter on target creature."
Grakmaw, Skyclave Ravager81%
$0.36↓#10052↓0.32↓5.9 years↑
"this card enters with three +1/+1 counters on it."
Junk Golem80%
$0.29↓#30022↓0.27↓24.9 years↑
"This creature enters with three +1/+1 counters on it."