13 cards where the name is exactly “great furnace”

Great Furnace (The List #MRD-282)
Great Furnace (The Brothers' War Commander #187)
Great Furnace (Secret Lair Drop #303)
Great Furnace (Commander 2021 #292)
Great Furnace (The List #C18-250)
Great Furnace (Commander 2018 #250)
Great Furnace (Commander Anthology Volume II #255)
Great Furnace (Duel Decks: Elves vs. Inventors #67)
Great Furnace (Commander 2014 #299)
Great Furnace (Planechase #133)
Great Furnace (World Championship Decks 2004 #mb282)
Great Furnace (World Championship Decks 2004 #ap282)
Great Furnace (Mirrodin #282)

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