Crypt Ghast
{3}{B}
Creature -- Spirit
2/2
Extort (Whenever you cast a spell, you may pay {w/b}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever you tap a Swamp for mana, add an additional {B}.
Nirkana Revenant
{4}{B}{B}
Creature -- Vampire Shade
4/4
Whenever you tap a Swamp for mana, add an additional {B}.
{B}: ~this~ gets +1/+1 until end of turn.
Nissa, Who Shakes the World
{3}{G}{G}
Legendary Planeswalker -- Nissa
5
Whenever you tap a Forest for mana, add an additional {G}.
[+1]: Put three +1/+1 counters on up to one target noncreature land you control. Untap it. It becomes a 0/0 Elemental creature with vigilance and haste that's still a land.
[-8]: You get an emblem with "Lands you control have indestructible." Search your library for any number of Forest cards, put them onto the battlefield tapped, then shuffle.