I just want to point out that Sundial, the staple of rainbow decks (including yours) has two abilities, one passive and one clicked on. So I've decided to change the abilities a little bit:
Earth Tree
Ability: Erosion(?): At the end of every one of your turns, two water quantums (one opponents', one yours) is changed into two earth quantums (both for you).
Ability: Plant (cost: 3 life): Make a seed.
Heavenly Tree
Ability: Sunlight (cost: 4 light quantum): Upgrade one seed, plant, or tree.
Ability: Reverse Photosynthesis: Converts two of your life quantum into two light quantum at the end of your turn.
This makes it mandatory that you lose two life and one water quantum at the end of every turn but gain earth and light, so it will factor in to strategy more, but I think it would work :p.