Ambitious Dragonborn 

Creature — Dragon Barbarian
$0.22 #12697 0.06 4.2 years
This creature enters with X +1/+1 counters on it, where X is the greatest power among creatures you control and creature cards in your graveyard.
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Cards similar to Ambitious Dragonborn 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.
Carrion Grub84%
$0.19↓#106190.25↑6.2 years↑
"This creature gets +X/+0, where X is the greatest power among creature cards in your graveyard."
Prime Speaker Zegana78%
$0.19↓#2805↑0.26↑13.6 years↑
"this card enters with X +1/+1 counters on it, where X is the greatest power among other creatures you control."
Shelinda, Yevon Acolyte70%
$0.25↑#5586↑0.47↑1.2 years↓
"Whenever another creature you control enters, put a +1/+1 counter on that creature if its power is less than this card's power. Otherwise, put a +1/+1 counter on this card."
Frontier Mastodon70%
$0.04↓#24582↓0.29↑11.6 years↑
"This creature enters with a +1/+1 counter on it if you control a creature with power 4 or greater."
Hamletback Goliath70%
$0.19↓#9036↑0.0018.9 years↑
"Whenever another creature enters, you may put X +1/+1 counters on this creature, where X is that creature's power."