Arc Reactor 
Artifact
$1.19 #6756 0.00 0.2 years
Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for 
.)
.)This artifact enters tapped.
: Add 
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Cards similar to Arc Reactor 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 Giant96%
$0.02↓#28877↓0.11↑9.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Foundry Assembler96%
$0.15↓#23319↓0.079.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Bastion Inventor96%
$0.02↓#28557↓0.27↑9.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Sweatworks Brawler96%
$0.04↓#29491↓0.47↑9.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Wind-Kin Raiders96%
$0.04↓#31018↓0.47↑9.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Barricade Breaker96%
$0.11↓#20149↓0.009.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Maverick Thopterist95%
$0.09↓#18937↓0.009.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Universal Surveillance95%
$0.25↓#5391↑0.044.5 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Reverse Engineer95%
$0.19↓#79770.50↑9.7 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Battle at the Bridge94%
$0.29↓#11608↓0.68↑9.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Bottle-Cap Blast94%
$4.62↑#4048↑0.34↑2.5 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Sly Requisitioner93%
$0.10↓#18060↓0.28↑9.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Freejam Regent93%
$0.17↓#25702↓0.43↑9.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Worn Powerstone92%
$0.32↓#574↑0.73↑27.9 years↑
"This artifact enters tapped."
+1 more matching line
Firemind Vessel92%
$0.18↓#4236↑0.29↑7.3 years↑
"This artifact enters tapped."
Fen Hauler91%
$0.06↓#28904↓0.009.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Synth Infiltrator90%
$0.27↓#8898↓0.43↑2.5 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Organic Extinction90%
$0.32↓#1326↑0.44↑4.5 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Metallic Rebuke90%
$0.27↓#10930↓0.17↑9.6 years↑
"Improvise Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for ."
."
Thran Dynamo88%
$2.12↑#201↑0.41↑27.2 years↑
": Add ."
: Add ."