Fecundity

Whenever a creature dies, that creature's controller may draw a card.

Fertile Ground

Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color.

Fortitude

Enchant creature
Sacrifice a Forest: Regenerate enchanted creature.
When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.

Gaea's Bounty

Search your library for up to two Forest cards, reveal those cards, put them into your hand, then shuffle.

Gaea's Embrace

Enchant creature
Enchanted creature gets +3/+3 and has trample.
{G}: Regenerate enchanted creature.

Gorilla Warrior

Greater Good

Sacrifice a creature: Draw cards equal to the sacrificed creature's power, then discard three cards.

Saproling

Greener Pastures

At the beginning of each player's upkeep, if that player controls more lands than each other player, the player creates a 1/1 green Saproling creature token.

Hawkeater Moth

Flying
Shroud (This creature can't be the target of spells or abilities.)

Opal Titan

When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 4/4 Giant creature with protection from each of that spell's colors.

Hidden Ancients

When an opponent casts an enchantment spell, if this permanent is an enchantment, it becomes a 5/5 Treefolk creature.

Hidden Guerrillas

When an opponent casts an artifact spell, if this permanent is an enchantment, it becomes a 5/3 Soldier creature with trample.

Hidden Herd

When an opponent plays a nonbasic land, if this permanent is an enchantment, it becomes a 3/3 Beast creature.

Hidden Predators

When an opponent controls a creature with power 4 or greater, if this permanent is an enchantment, it becomes a 4/4 Beast creature.

Hidden Spider

When an opponent casts a creature spell with flying, if this permanent is an enchantment, it becomes a 3/5 Spider creature with reach. (It can block creatures with flying.)

Hidden Stag

Whenever an opponent plays a land, if this permanent is an enchantment, it becomes a 3/2 Elk Beast creature.
Whenever you play a land, if this permanent is a creature, it becomes an enchantment.

Urza's Saga