Rhonas's Monument 
Legendary Artifact
$0.42 #2126 0.27 9.5 years
Green creature spells you cast cost 
less to cast.
less to cast.Whenever you cast a creature spell, target creature you control gets +2/+2 and gains trample until end of turn.
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Cards similar to Rhonas's Monument 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.
Emerald Medallion88%
$5.16↑#582↑0.3029.0 years↑
"Green spells you cast cost less to cast."
less to cast."
Planar Gate87%
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"Creature spells you cast cost 
less to cast."
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Oketra's Monument82%
$3.33↑#1051↑0.209.5 years
"White creature spells you cast cost less to cast."
less to cast."
Honest Rutstein80%
$0.38↓#18550.16↓2.5 years↓
"Creature spells you cast cost less to cast."
less to cast."
Sunscape Familiar79%
$1.32↑#6171↓0.00↓25.7 years↑
"Green spells and blue spells you cast cost less to cast."
less to cast."
Nylea, Keen-Eyed78%
$4.40↑#3608↓0.256.7 years↓
"Creature spells you cast cost less to cast."
less to cast."
Heartless Summoning78%
$1.63↑#2677↓0.3715.1 years↑
"Creature spells you cast cost less to cast."
less to cast."
The Earth Crystal78%
$12.45↑#678↑0.46↑1.4 years↓
"Green spells you cast cost less to cast."
less to cast."
Thunderscape Familiar78%
$0.31↓#15837↓0.00↓25.7 years↑
"Black spells and green spells you cast cost less to cast."
less to cast."
Kefnet's Monument78%
$0.38↓#5045↓0.47↑9.5 years
"Blue creature spells you cast cost less to cast."
less to cast."+1 more matching line
Marauding Raptor77%
$0.85↑#3049↓0.197.3 years↓
"Creature spells you cast cost less to cast."
less to cast."
Goblin Anarchomancer76%
$0.34↓#558↑0.17↓5.3 years↓
"Each spell you cast that's red or green costs less to cast."
less to cast."
The Sibsig Ceremony76%
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"Creature spells you cast cost less to cast."
less to cast."
Warden of Evos Isle76%
$0.18↓#3779↓0.04↓13.3 years↑
"Creature spells with flying you cast cost less to cast."
less to cast."
Bontu's Monument75%
$2.16↑#665↑0.329.5 years
"Black creature spells you cast cost less to cast."
less to cast."
Hazoret's Monument75%
$0.57↑#19140.209.5 years
"Red creature spells you cast cost less to cast."
less to cast."
Defiler of Vigor74%
$3.28↑#1644↑0.46↑4.1 years↓
"As an additional cost to cast green permanent spells, you may pay 2 life. Those spells cost 
less to cast if you paid life this way. This effect reduces only the amount of green mana you pay."
less to cast if you paid life this way. This effect reduces only the amount of green mana you pay."
Herald's Horn74%
$2.80↑#151↑0.249.2 years
"Creature spells you cast of the chosen type cost less to cast."
less to cast."
Urza's Incubator74%
$20.34↑#311↑0.62↑27.4 years↑
"Creature spells of the chosen type cost less to cast."
less to cast."
Watcher of the Spheres74%
$0.63↑#4274↓0.03↓6.3 years↓
"Creature spells with flying you cast cost less to cast."
less to cast."