Prehistoric Turtlesaurus 
Creature — Mutant Ninja Turtle Dinosaur
$0.19 #27102 0.00 0.5 years
This spell costs 
less to cast if you control a creature with a +1/+1 counter on it.
less to cast if you control a creature with a +1/+1 counter on it.Vigilance (Attacking doesn't cause this creature to tap.)
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Cards similar to Prehistoric Turtlesaurus 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.
Titanic Brawl82%
$0.13↓#7922↑0.32↑7.6 years↑
"This spell costs less to cast if it targets a creature you control with a +1/+1 counter on it."
less to cast if it targets a creature you control with a +1/+1 counter on it."
Dusk Legion Duelist80%
$1.80↑#2736↑0.19↑3.4 years↑
"Vigilance"
Deepwood Denizen79%
$0.26↑#10696↑0.32↑5.2 years↑
"Vigilance"
Hamza, Guardian of Arashin78%
$0.28↑#3443↑0.29↑5.8 years↑
"This spell costs less to cast for each creature you control with a +1/+1 counter on it."
less to cast for each creature you control with a +1/+1 counter on it."
Lumbering Megasloth77%
$0.37↑#11685↑0.29↑2.5 years↑
"This spell costs less to cast for each counter among players and permanents."
less to cast for each counter among players and permanents."
Veteran Adventurer75%
$0.19#229920.005.9 years↑
"Vigilance"
Daghatar the Adamant75%
$0.17↓#238300.38↑11.6 years↑
"Vigilance"
Knight of Wundagore72%
$0.09↓#21078↑0.000.2 years
"Whenever you put a +1/+1 counter on another creature, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Avatar of the Resolute72%
$0.30↑#16960↑0.26↑11.4 years↑
"This creature enters with a +1/+1 counter on it for each other creature you control with a +1/+1 counter on it."
Ollenbock Escort72%
$0.24↑#15433↑0.004.8 years↑
"Vigilance"
Enduring Scalelord72%
$0.13↓#11165↑0.20↑11.4 years↑
"Whenever one or more +1/+1 counters are put on another creature you control, you may put a +1/+1 counter on this creature."
She-Hulk, Attorney-at-Law70%
$0.27↑#247380.000.2 years
"Vigilance"
Botanical Brawler70%
$0.32↑#6758↑0.27↑3.4 years↑
"Whenever one or more +1/+1 counters are put on another permanent you control, if it's the first time +1/+1 counters have been put on that permanent this turn, put a +1/+1 counter on this creature."
Hierophant Bio-Titan70%
$1.75↑#8043↑0.32↑3.9 years↑
"As an additional cost to cast this spell, you may remove any number of +1/+1 counters from among creatures you control. This spell costs 
less to cast for each counter removed this way."
less to cast for each counter removed this way."