A few green cards:

Academy Ecologist G
Creature - Elf Wizard
Whenever the effect of a spell or ability an opponent controls causes that player to shuffle his or her library, you may draw a card.

Appeal to Nature G
Proliferate X times, where X is the number of nonbasic lands target opponent controls.

Archdruid of Boseiju GG
Creature - Snake Shaman
Archdruid of Boseiju enters the battlefield tapped.
T: Add C. If that mana is spent on a spell, that spell canít be countered by spells or abilities.

Bestial Spirit Guide 3G
Creature - Beast Spirit
Discard Bestial Spirit Guide: Add G. Spend this mana only to cast creature spells.
Dredge 2

Canopy Stride G
At the beginning of your upkeep, look at the top card of your library. You may reveal that card. If itís a creature card with converted mana cost equal to or less than the number of basic forests you control, put it onto the battlefield under your control.

Conspiracy of Leaves G
If an opponent cast a blue spell this turn and itís your turn, draw a card.

Elven Decorator G
Creature - Elf Advisor
T: Put a fair counter on target land you control.
Whenever a land you control with a fair counter on it is tapped for mana, add G.

Gaea's Prayer G
Look at the top three cards of your library. You may reveal a creature card from among them and put it into your hand. Then put one of the other cards on top and the rest on the bottom of your library in any order.
The next creature card you cast this turn can be cast as though it had flash.

Mists of Dawn 2GG
World Enchantment
If a player would draw a card, each other player draws a card instead.

Nature's Fate G
Scry X-1, where X is the number of permanents you control with a mana ability.
Draw a card.

Protectionist's Drive G
Spells with converted mana cost 1 or less cost 1 more to cast.
Activated abilities of permanents with converted mana cost 1 or less cost 1 more to activate unless theyíre mana abilities.

Sudden Boa 1GG
Creature - Snake
Split second
Islandwalk, swampwalk
G: Regenerate Sudden Boa.

Verdant Outskirts GGG
Whenever a player casts a spell, that player sacrifices a nonbasic land.