Moon-Boy, Dino Rider 
Legendary Creature — Ape Human
$0.29 #24212 0.00 0.2 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 Caller98%
$0.29#6320↑0.058.9 years↑
"Dinosaur spells you cast cost less to cast."
less to cast."
Knight of the Stampede98%
$0.36↑#7040↑0.078.6 years↑
"Dinosaur spells you cast cost 
less to cast."
less to cast."
Otepec Huntmaster97%
$0.37↑#3099↑0.21↑8.9 years↑
"Dinosaur spells you cast cost less to cast."
less to cast."+1 more matching line
Tilonalli's Knight96%
$0.07↓#29084↓0.008.9 years↑
"Whenever this creature attacks, if you control a Dinosaur, this creature gets +1/+1 until end of turn."
Marauding Raptor86%
$0.91↑#3000↑0.18↑7.2 years↑
"Creature spells you cast cost less to cast."
less to cast."+1 more matching line
Burning Sun Cavalry84%
$0.10↓#257370.31↑2.8 years↑
"Whenever this creature attacks or blocks while you control a Dinosaur, this creature gets +1/+1 until end of turn."
Pugnacious Hammerskull82%
$0.61↑#5310↑0.24↑2.8 years↑
"Whenever this creature attacks while you don't control another Dinosaur, put a stun counter on it."
Triceraton Commander82%
$1.50↑#14673↑0.000.5 years
"Whenever this creature attacks, Dinosaurs you control other than this creature get +1/+1 and gain flying until end of turn."
Sunfrill Imitator82%
$1.43↑#3769↑0.23↑2.8 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."
Planar Gate82%
$77.60↑#213200.68↑32.3 years↑
"Creature spells you cast cost less to cast."
less to cast."
Drover of the Mighty80%
$0.22↓#5999↑0.33↑8.9 years↑
"This creature gets +2/+2 as long as you control a Dinosaur."
Savage Stomp79%
$0.23↓#6158↑0.80↑8.9 years↑
"This spell costs less to cast if it targets a Dinosaur you control."
less to cast if it targets a Dinosaur you control."
Stampeding Horncrest77%
$0.08↓#263770.24↑8.6 years↑
"This creature has haste as long as you control another Dinosaur."
Thrash of Raptors76%
$0.09↓#217790.008.9 years↑
"As long as you control another Dinosaur, this creature gets +2/+0 and has trample."
Majestic Heliopterus76%
$0.21↓#9551↑0.17↑8.6 years↑
"Whenever this creature attacks, another target Dinosaur you control gains flying until end of turn."
Dragonlord's Servant76%
$0.28↓#1344↑0.22↑11.4 years↑
"Dragon spells you cast cost less to cast."
less to cast."
Dragonspeaker Shaman76%
$1.98↑#1312↑0.26↑23.3 years↑
"Dragon spells you cast cost less to cast."
less to cast."
Honest Rutstein75%
$0.39↑#1787↑0.19↑2.4 years↑
"Creature spells you cast cost less to cast."
less to cast."
Pterodon Knight74%
$0.03↓#29352↓0.27↑8.9 years↑
"This creature has flying as long as you control a Dinosaur."
Sun-Crested Pterodon74%
$0.20↓#244430.20↑8.6 years↑
"This creature has vigilance as long as you control another Dinosaur."