Command Tower

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

Sol Ring

Plains

Forest

Arcane Signet

Yavimaya, Cradle of Growth

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

Journey On

Create X Map tokens, where X is one plus the number of opponents who control an artifact. (Then exile this card. You may cast the creature later from exile.)

Kellan, Daring Traveler

Whenever Kellan, Daring Traveler attacks, reveal the top card of your library. If it's a creature card with mana value 3 or less, put it into your hand. Otherwise, you may put it into your graveyard.