I dont think its important to note that there was a factor of 1.97 for Black cards and 2.2 for Red cards, I think its more important to note that the colored cards, no matter the color, accounted for roughly half of the decks and artifacts can go in any deck
A solid red commander and pretty popular in the 99, Purphoros, God of the Forge is a potent, and fairly pricey card: The regular version for the original Theros printing sits around $25, and later premium versions are close to $50
To play a Spell, put it face-up in one of your Spell/Trap Zones, then do what it says
During your End Phase: You can activate each of these effects up to once per turn, depending on the total number of "Noble Knight" cards with different names in your Graveyard and/or you control
It does 20 damage times the number of cards in your opponents hand