Make Everything Green

Flash, you can play this as an Instant
All lands become a Forest until end of turn
Creatures that aren't Green or have {g} in there color identity before this spell, becomes a Green 1/1 Saproling until end of turn
Artifacts become a Green 1/1 Saproling until end of turn
Planewalkers that aren't Green or have {g} in there color identity before this spell, becomes a Land until end of turn