19 cards where the text includes “{e}” and the card types include “artifact” and the text includes “pay”

Aethersphere Harvester (Aether Revolt #142)
Aetherworks Marvel (Kaladesh #193)
Assaultron Dominator (Fallout #54)
Automated Assembly Line (Fallout #10)
Behemoth of Vault 0 (Fallout #127)
Consulate Turret (Aether Revolt #147)
Deadlock Trap (Kaladesh #204)
Dynavolt Tower (Kaladesh #208)
Electrostatic Pummeler (Kaladesh #210)
Gonti's Aether Heart (Aether Revolt #152)
Liberty Prime, Recharged (Fallout #5)
Multiform Wonder (Kaladesh #223)
Plasma Caster (Fallout #64)
Rex, Cyber-Hound (Fallout #117)
Robobrain War Mind (Fallout #38)
Sentry Bot (Fallout #24)
Synth Eradicator (Fallout #67)
T-45 Power Armor (Fallout #145)
The Motherlode, Excavator (Fallout #62)

The message was clear to Sorin—time to search for something else.