Ramunap Hydra 
Creature — Snake Hydra
$0.37 #16373 0.47 9.1 years
Reach, vigilance, trample
This creature gets +1/+1 as long as you control a Desert.
This creature gets +1/+1 as long as there is a Desert card in your graveyard.
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Cards similar to Ramunap 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.
Sidewinder Naga91%
$0.10↓#27642↓0.00↓9.1 years
"As long as you control a Desert or there is a Desert card in your graveyard, this creature gets +1/+0 and has trample."
Solitary Camel86%
$0.09↓#27713↓0.00↓9.1 years
"This creature has lifelink as long as you control a Desert or there is a Desert card in your graveyard."
Outcaster Greenblade80%
$0.18↓#136820.00↓2.4 years↓
"This creature gets +1/+1 for each Desert you control."
Wretched Camel80%
$0.10↓#30314↓0.29↓9.1 years
"When this creature dies, if you control a Desert or there is a Desert card in your graveyard, target player discards a card."
Desert's Hold79%
$0.18↓#21220↓0.25↓9.1 years
"When this Aura enters, if you control a Desert or there is a Desert card in your graveyard, you gain 3 life."
Cactarantula77%
$0.07↓#159820.382.4 years↓
"This spell costs 
less to cast if you control a Desert."
less to cast if you control a Desert."
Gilded Cerodon77%
$0.05↓#28181↓0.22↓9.1 years
"Whenever this creature attacks, if you control a Desert or there is a Desert card in your graveyard, target creature can't block this turn."
Gorilla Titan76%
$0.36↓#21616↓0.5024.9 years↑
"This creature gets +4/+4 as long as there are no cards in your graveyard."
Colossal Rattlewurm73%
$0.25↓#10085↑0.06↓2.4 years↓
"this card has flash as long as you control a Desert."
+1 more matching line
Frilled Cave-Wurm72%
$0.11↓#26927↓0.35↓2.8 years↓
"Descend 4 — This creature gets +2/+0 as long as there are four or more permanent cards in your graveyard."
Basking Capybara72%
$0.13↓#23230↓0.06↓2.8 years↓
"Descend 4 — This creature gets +3/+0 as long as there are four or more permanent cards in your graveyard."
Dune Diviner72%
$0.08↓#28372↓0.00↓9.1 years
", Tap an untapped Desert you control: You gain 1 life."
, Tap an untapped Desert you control: You gain 1 life."