Command Tower

{T}: Add one mana of any color in your commander's color identity.

Swamp

Ignoble Hierarch

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
{T}: Add {B}, {R}, or {G}.

Sol Ring

Savage Lands

This land enters tapped.
{T}: Add {B}, {R}, or {G}.

Coram, the Undertaker

Coram gets +X/+0, where X is the greatest power among creature cards in all graveyards.
Whenever Coram attacks, each player mills a card.
During each of your turns, you may play a land and cast a spell from among cards in graveyards that were put there from libraries this turn.

Mountain

Forest

Exotic Orchard

{T}: Add one mana of any color that a land an opponent controls could produce.