Freestrider Commando 

Creature — Centaur Mercenary
This creature enters with two +1/+1 counters on it if it wasn't cast or no mana was spent to cast it.
Plot {3}{G} (You may pay {3}{G} and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)
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Cards that do something similar 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.
Effortless Master 91%
$0.06#21931
"This creature enters with two +1/+1 counters on it if you've cast two or more spells this turn."
Epochrasite 91%
$0.37#14826
"This creature enters with three +1/+1 counters on it if you didn't cast it from your hand."
Steel Exemplar 89%
$0.15#21264
"This creature enters with two +1/+1 counters on it unless two or more colors of mana were spent to cast it."
Glinting Creeper 88%
$0.13#25446
"This creature enters with two +1/+1 counters on it for each color of mana spent to cast it."