14 cards where the card types include “artifact” and the card types include “dragon” and the color identity ≤ R

Steel Hellkite (Murders at Karlov Manor Commander #239)
Scion of Draco (Modern Horizons 2 #234)
Phyrexian Dragon Engine (The Brothers' War #163a)
Draco (Planeshift #131)
Moltensteel Dragon (New Phyrexia #88)
Arcbound Whelp (Modern Horizons 2 #113)
Artificer's Dragon (The Brothers' War #291)
Fallaji Dragon Engine (The Brothers' War #159)
Chardalyn Dragon (Commander Legends: Battle for Baldur's Gate #306)
Clockwork Dragon (Mirrodin #155)
Teeka's Dragon (Mirage #320)
Lotus Guardian (Invasion #305)
Tek (Invasion #313)
Henge Guardian (Duel Decks: Knights vs. Dragons #55)

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