Mirror-Sigil Sergeant 

Creature — Rhino Soldier
Trample
At the beginning of your upkeep, if you control a blue permanent, you may create a token that's a copy of this creature.
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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.
Biowaste Blob 93%
$0.40#6889
"At the beginning of your upkeep, if you control a commander, create a token that's a copy of this creature."
Cryptoplasm 83%
$0.60#12516
"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."