Heart of Yavimaya is a rare Land card from World Championship Decks 1997 (WC97), collector number sg138. Current market price: $0.60, TCGplayer market prices via Scryfall.
If this land would enter, sacrifice a Forest instead. If you do, put this land onto the battlefield. If you don't, put it into its owner's graveyard. {T}: Add {G}. {T}: Target creature gets +1/+1 until end of turn.