Moon-Boy, Dino Rider 
Legendary Creature — Ape Human
$0.28 #23402 0.17 0.3 years
Dinosaur spells you cast cost less to cast.
less to cast.Whenever Moon-Boy attacks while you control a Dinosaur, Moon-Boy gets +1/+1 until end of turn.
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Cards similar to Moon-Boy, Dino Rider 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.
Kinjalli's Caller99%
$0.27↓#6411↑0.00↓9.1 years↑
"Dinosaur spells you cast cost less to cast."
less to cast."
Knight of the Stampede99%
$0.32↑#7166↑0.44↑8.8 years↑
"Dinosaur spells you cast cost 
less to cast."
less to cast."
Otepec Huntmaster98%
$0.38↑#3147↑0.149.1 years↑
"Dinosaur spells you cast cost less to cast."
less to cast."+1 more matching line
Tilonalli's Knight96%
$0.09↓#29396↓0.249.1 years↑
"Whenever this creature attacks, if you control a Dinosaur, this creature gets +1/+1 until end of turn."
Burning Sun Cavalry86%
$0.13↓#262110.00↓2.9 years↑
"Whenever this creature attacks or blocks while you control a Dinosaur, this creature gets +1/+1 until end of turn."
Pugnacious Hammerskull86%
$0.19↓#5244↑0.00↓2.9 years↑
"Whenever this creature attacks while you don't control another Dinosaur, put a stun counter on it."
Marauding Raptor85%
$0.85↑#3049↑0.197.3 years↑
"Creature spells you cast cost less to cast."
less to cast."+1 more matching line
Drover of the Mighty83%
$0.21↓#6087↑0.209.1 years↑
"This creature gets +2/+2 as long as you control a Dinosaur."
Thrash of Raptors81%
$0.08↓#221050.05↓9.1 years↑
"As long as you control another Dinosaur, this creature gets +2/+0 and has trample."
Stampeding Horncrest81%
$0.07↓#267160.00↓8.8 years↑
"This creature has haste as long as you control another Dinosaur."
Planar Gate80%
$74.69↑#214340.38↑32.4 years↑
"Creature spells you cast cost less to cast."
less to cast."
Sunfrill Imitator80%
$1.71↑#3841↑0.36↑2.9 years↑
"Whenever this creature attacks, you may have it become a copy of another target Dinosaur you control, except its name is this card and it has this ability."
Majestic Heliopterus79%
$0.22↓#9796↑0.128.8 years↑
"Whenever this creature attacks, another target Dinosaur you control gains flying until end of turn."
Savage Stomp78%
$0.23↓#6210↑0.00↓9.1 years↑
"This spell costs less to cast if it targets a Dinosaur you control."
less to cast if it targets a Dinosaur you control."
Triceraton Commander78%
$0.85↑#14326↑0.45↑0.6 years
"Whenever this creature attacks, Dinosaurs you control other than this creature get +1/+1 and gain flying until end of turn."
Dragonlord's Servant78%
$0.19↓#1346↑0.2111.6 years↑
"Dragon spells you cast cost less to cast."
less to cast."
Dragonspeaker Shaman78%
$0.36↑#1313↑0.29↑23.4 years↑
"Dragon spells you cast cost less to cast."
less to cast."
Pterodon Knight78%
$0.04↓#29744↓0.00↓9.1 years↑
"This creature has flying as long as you control a Dinosaur."
Sun-Crested Pterodon77%
$0.23↓#246280.00↓8.8 years↑
"This creature has vigilance as long as you control another Dinosaur."
Imperial Lancer76%
$0.08↓#28609↓0.00↓9.1 years↑
"This creature has double strike as long as you control a Dinosaur."