Whir of Invention 
Instant
$5.49 #1336 0.50 9.7 years
Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for 
.)
.)Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle.
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Cards similar to Whir of Invention 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.
Enraged Giant94%
$0.05↓#29191↓0.30↓9.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Foundry Assembler94%
$0.13↓#23704↓0.05↓9.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Wind-Kin Raiders94%
$0.04↓#31302↓0.00↓9.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Sweatworks Brawler94%
$0.04↓#29858↓0.12↓9.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Barricade Breaker92%
$0.11↓#20318↓0.11↓9.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Bastion Inventor92%
$0.03↓#28814↓0.06↓9.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Universal Surveillance90%
$0.20↓#5351↓0.06↓4.7 years↓
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Reverse Engineer90%
$0.18↓#8030↓0.12↓9.8 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Maverick Thopterist90%
$0.11↓#19037↓0.24↓9.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Reshape90%
$3.70↓#3146↓0.63↑22.7 years↑
"Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle."
Battle at the Bridge89%
$0.28↓#11811↓0.06↓9.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Bottle-Cap Blast88%
$1.86↓#4053↓0.36↓2.6 years↓
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Sly Requisitioner88%
$0.10↓#18507↓0.15↓9.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Freejam Regent88%
$0.16↓#26010↓0.00↓9.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Arc Reactor88%
$0.92↓#5591↓0.28↓0.3 years↓
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Synth Infiltrator86%
$0.29↓#9035↓0.06↓2.6 years↓
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Fen Hauler86%
$0.05↓#29250↓0.06↓9.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Organic Extinction86%
$0.33↓#13140.484.7 years↓
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Metallic Rebuke86%
$0.25↓#10837↓0.449.7 years
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Ironheart, Clever Champion84%
$0.37↓#9990↓0.26↓0.3 years↓
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."