Your search for "Forgotten Cave 814" revealed the following:
Forgotten Cave (C14) from Commander 2014, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Noah Bradley 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 (J22) from Jumpstart 2022, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Tony Szczudlo 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...