Alacrian Armory 

Artifact
Creatures you control get +0/+1 and have vigilance.
At the beginning of combat on your turn, choose up to one target Mount or Vehicle you control. Until end of turn, that permanent becomes saddled if it's a Mount and becomes an artifact creature if it's a Vehicle.
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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.
The Super Hero Civil War 88%
$0.31#22652
"Creatures you control get +1/+1 and gain vigilance until end of turn."
Three Blind Mice 88%
$0.40#6383
"Creatures you control get +1/+1 and gain vigilance until end of turn."
Marshaling Cry 88%
$0.26#24061
"Creatures you control get +1/+1 and gain vigilance until end of turn."
Preposterous Proportions 87%
$1.02#3000
"Creatures you control get +10/+10 and gain vigilance until end of turn."
Jetmir, Nexus of Revels 84%
$10.44#2144
"Creatures you control get +1/+0 and have vigilance as long as you control three or more creatures."