Name:Great Furnace
ManaCost:no cost
Types:Artifact Land
Text:(Great Furnace isn't a spell.)
A:AB$ Mana | Cost$ T | Produced$ R | SpellDescription$ Add {R} to your mana pool.
SVar:Picture:http://www.wizards.com/global/images/magic/general/great_furnace.jpg
Oracle:{T}: Add {R} to your mana pool.