Hum of the Radix 


Enchantment
Each artifact spell costs {1} more to cast for each artifact its controller controls.
click a line to search just that ability, click more to combine them
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.
Forensic Gadgeteer 82%
$1.50#1374
"Activated abilities of artifacts you control cost {1} less to activate. This effect can't reduce the mana in that cost to less than one mana."
Cavern-Hoard Dragon 82%
$14.28#1475
"This spell costs {X} less to cast, where X is the greatest number of artifacts an opponent controls."
Stoic Rebuttal 82%
$0.30#6572
"This spell costs {1} less to cast if you control three or more artifacts."