Mossborn Hydra 
Creature — Elemental Hydra
$13.45 #747 0.95 1.9 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%
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"this card enters with two +1/+1 counters on it."
Kalonian Hydra94%
$6.14↓#1136↓0.48↓13.3 years↑
"This creature enters with four +1/+1 counters on it."
+1 more matching line
Sisterhood of Karn92%
$0.23↓#12410↓0.37↓3.0 years↑
"This creature enters with a +1/+1 counter on it."
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$24.37↑#918↓1.002.5 years
"Whenever a land you control enters, put a +1/+1 counter on target creature."
Scythecat Cub90%
$28.04↑#2815↓0.76↓1.9 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%
$0.32↓#11286↓0.29↓4.7 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Vinelasher Kudzu88%
$0.35↓#13535↓0.00↓21.0 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Territorial Scythecat88%
$0.16↓#8109↓0.24↓6.1 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Prowling Felidar88%
$0.17↓#14289↓0.20↓6.1 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Sazh's Chocobo88%
$0.51↓#2990↓0.44↓1.4 years
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Primordial Hydra87%
$1.37↓#2429↓0.55↓15.3 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Murasa Ranger84%
$0.08↓#27217↓0.00↓11.0 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%
$0.25↓#6379↓0.29↓5.5 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."
Sage of the Fang83%
$0.19↓#14607↓0.07↓1.5 years
"When this creature enters, put a +1/+1 counter on target creature."
Solarion82%
$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."
Swarm Shambler82%
$0.19↓#15392↓0.07↓6.1 years↑
"This creature enters with a +1/+1 counter on it."
The Thing82%
$0.37↓#15354↓0.42↓0.3 years↓
"Trample"
Slurrk, All-Ingesting81%
$0.29↓#9684↓0.11↓5.9 years↑
"this card enters with five +1/+1 counters on it."
Grakmaw, Skyclave Ravager80%
$0.35↓#10333↓0.26↓6.1 years↑
"this card enters with three +1/+1 counters on it."
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$2.54↓#2635↓1.031.8 years
"Whenever a land you control enters, double this card's power until end of turn."
+1 more matching line