Blighted Fen

{T}: Add {C}.
{4}{B}, {T}, Sacrifice Blighted Fen: Target opponent sacrifices a creature of their choice.

Sol Ring

Command Tower

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

Forest

Reliquary Tower

You have no maximum hand size.
{T}: Add {C}.

Swamp

Ramunap Excavator

The Gitrog Monster

Deathtouch
At the beginning of your upkeep, sacrifice The Gitrog Monster unless you sacrifice a land.
You may play an additional land on each of your turns.
Whenever one or more land cards are put into your graveyard from anywhere, draw a card.