Leafkin Druid

{T}: Add {G}. If you control four or more creatures, add {G}{G} instead.

Wood Elves

When Wood Elves enters, search your library for a Forest card, put that card onto the battlefield, then shuffle.

Kalonian Tusker

Explore

You may play an additional land this turn.
Draw a card.

Verdant Force

At the beginning of each upkeep, create a 1/1 green Saproling creature token.

Forest

Llanowar Visionary

When Llanowar Visionary enters, draw a card.
{T}: Add {G}.

Colossadactyl

Garruk's Packleader

Whenever another creature you control with power 3 or greater enters, you may draw a card.

Archweaver

Force of Nature

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
At the beginning of your upkeep, Force of Nature deals 8 damage to you unless you pay {G}{G}{G}{G}.