Your search for "Mountain 443" revealed the following:
Mountain (443) (5ED) from Fifth Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: John Avon Card Text:T: Add R to your mana pool.
Mountain (pm443) (WC97) (Paul McCabe) from World Championship Decks 1997, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: John Avon Card Text:T: Add R to your mana pool.Not a Tournament Legal card.