Your search for "Forgotten Cave 343" revealed the following:
Forgotten Cave (C13) from Commander 2013, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Tony Szczudlo Card Text:Forgotten Cave enters the battlefield tapped.T: Add R to your mana pool.Cycling R (R, Discard this card: Draw a card.)
Forgotten Cave (M3C) from Modern Horizons 3 Commander, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Wayne Wu Card Text:Forgotten Cave enters the battlefield tapped.T: Add R.Cycling R (R, Discard this card: Draw a card.)
Forgotten Cave (DDJ) from Duel Decks: Izzet vs. Golgari, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Tony Szczudlo Card Text:Forgotten Cave enters the battlefield tapped.T: Add R to your mana pool.Cycling R (R, Discard this card: Draw...
Forgotten Cave - M3C Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Wayne Wu Card Text:Forgotten Cave enters the battlefield tapped.T: Add R.Cycling R (R, Discard this card: Draw a card.)