Hidden Gibbons

When an opponent casts an instant spell, if Hidden Gibbons is an enchantment, Hidden Gibbons becomes a 4/4 Ape creature.

Rogue Elephant

When Rogue Elephant enters, sacrifice it unless you sacrifice a Forest.

Bounty of the Hunt

You may exile a green card from your hand rather than pay this spell's mana cost.
Distribute three +1/+1 counters among one, two, or three target creatures. For each +1/+1 counter you put on a creature this way, remove a +1/+1 counter from that creature at the beginning of the next cleanup step.

Rancor

Enchant creature
Enchanted creature gets +2/+0 and has trample.
When Rancor is put into a graveyard from the battlefield, return Rancor to its owner's hand.

Quirion Ranger

Return a Forest you control to its owner's hand: Untap target creature. Activate only once each turn.

Forest

Land Grant

If you have no land cards in hand, you may reveal your hand rather than pay this spell's mana cost.
Search your library for a Forest card, reveal that card, put it into your hand, then shuffle.

Llanowar Elves

Vine Dryad

You may exile a green card from your hand rather than pay this spell's mana cost.
Flash
Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)

Elvish Spirit Guide

Exile Elvish Spirit Guide from your hand: Add {G}.

Harvest Wurm

When Harvest Wurm enters, sacrifice it unless you return a basic land card from your graveyard to your hand.

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.

Pouncing Jaguar

Echo {G} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

Giant Growth

Target creature gets +3/+3 until end of turn.

Winter Orb

As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.

Skyshroud Elite

Skyshroud Elite gets +1/+2 as long as an opponent controls a nonbasic land.

Seal of Strength

Sacrifice Seal of Strength: Target creature gets +3/+3 until end of turn.

River Boa

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{G}: Regenerate River Boa.