Unstable, +m/(for\seach\sartifact|number\sof\sartifacts).*(control|on\sthe\sbattlefield)/, +!affinity (2)
Whenever you crank Rapid Prototyper, create an X/X colorless Construct artifact creature token, where X is the number of artifacts you control.
Whenever you crank Record Store, look at the top X cards of your library, where X is the number of artifacts you control. Put one of those cards into your hand and the rest on the bottom of your library in a random order.
Gatherer works better in the Companion app!