Heart of Yavimaya

If Heart of Yavimaya would enter, sacrifice a Forest instead. If you do, put Heart of Yavimaya 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.

Masters Edition II

If Heart of Yavimaya would come into play, sacrifice a Forest instead. If you do, put Heart of Yavimaya into play. If you don't, put it into its owner's graveyard.
{T}: Add {G} to your mana pool.
{T}: Target creature gets +1/+1 until end of turn.

World Championship Decks 1997

Alliances

When Heart of Yavimaya comes into play, sacrifice a forest or bury Heart of Yavimaya.
oc
T: Add o
G to your mana pool.
oc
T: Target creature gets +1/+1 until end of turn.

You have to sacrifice a forest before this card is put onto the battlefield, and no matter how it is put onto the battlefield.