Sythis, Harvest's Hand

Whenever you cast an enchantment spell, you gain 1 life and draw a card.

Urborg, Tomb of Yawgmoth

Each land is a Swamp in addition to its other land types.

Utopia Sprawl

Enchant Forest
As this Aura enters, choose a color.
Whenever enchanted Forest is tapped for mana, its controller adds an additional one mana of the chosen color.

Sanctum Weaver

{T}: Add X mana of any one color, where X is the number of enchantments you control.

Verdant Catacombs

{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.

Spreading Algae

Enchant Swamp
When enchanted land becomes tapped, destroy it.
When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.

Windswept Heath

{T}, Pay 1 life, Sacrifice this land: Search your library for a Forest or Plains card, put it onto the battlefield, then shuffle.