1E: Gauntlet of Might, Artifact 4 Red creatures get +1/+1. Whenever a Mountain is tapped for mana, its controller adds an additional {R}.

Gauntlet of Might

Red creatures get +1/+1.

Whenever a Mountain is tapped for mana, its controller adds an additional R.

10/4/2004 Dual lands which have Mountain as one of their types produce an extra red mana when tapped for either color.

Name	Type	Subtype	Color	Cost	Rarity	Set	Price
Gauntlet of Might	Artifact	-	Colorless	4	Rare	Limited Edition Beta	$999.95
Gauntlet of Might	Artifact	-	Colorless	4	Rare	Unlimited Edition	$804.99
Gauntlet of Might	Artifact	-	Colorless	4	Rare	Masters Edition IV