Oran-Rief Hydra 
Creature — Hydra
$0.44 #5818 0.00 10.9 years
Trample
Landfall — Whenever a land you control enters, put a +1/+1 counter on this creature. If that land is a Forest, put two +1/+1 counters on this creature instead.
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Cards similar to Oran-Rief 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.
Battlewand Oak84%
$0.18↓#17368↓0.0018.9 years↑
"Whenever a Forest you control enters, this creature gets +2/+2 until end of turn."
Territorial Scythecat80%
$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 Kudzu80%
$0.34↓#13232↓0.56↑20.9 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Sazh's Chocobo80%
$1.12↑#3068↑0.37↑1.2 years↓
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Prowling Felidar80%
$0.18↓#14068↓0.67↑5.9 years↓
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Necklace of Girion78%
$17.90↑#11884↓0.000.1 years↓
"Whenever you cast a green spell and whenever a Forest you control enters, put a +1/+1 counter on target creature you control."
Murasa Ranger77%
$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."
Carnage Wurm77%
$0.14↓#18932↓0.29↑15.1 years↑
"Trample"
Scab-Clan Mauler77%
$0.04↓#27372↓0.22↑21.0 years↑
"Trample"
Titania, Nature's Force75%
$0.87↑#4052↑0.39↑3.8 years↓
"Whenever a Forest you control enters, create a 5/3 green Elemental creature token."
Hobblefiend74%
$0.29↓#15997↓0.006.2 years↓
"Trample"
Reach of Branches74%
$0.33↓#14713↓0.57↑18.6 years↑
"Whenever a Forest you control enters, you may return this card from your graveyard to your hand."
Rest for the Weary74%
$0.20↓#14719↓0.0516.6 years↑
"If you had a land enter the battlefield under your control this turn, that player gains 8 life instead."
Kronch Wrangler74%
$0.04↓#24544↓0.007.3 years↓
"Trample"
Undergrowth Champion73%
$0.38↓#8301↓0.42↑10.9 years
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Mossborn Hydra72%
$12.69↑#777↑0.75↑1.8 years↓
"Whenever a land you control enters, double the number of +1/+1 counters on this creature."
Graypelt Hunter72%
$0.16↓#21352↓0.50↑16.6 years↑
"Trample"
Electrostatic Infantry72%
$0.35↓#63760.28↑4.0 years↓
"Trample"
Clockwork Vorrac72%
$0.12↓#24989↓0.0022.9 years↑
"Trample"
Floral Evoker72%
$0.30↓#7164↓0.23↑1.4 years↓
"Whenever a land you control enters, put a +1/+1 counter on this creature."