Aragorn, the Uniter

Whenever you cast a white spell, create a 1/1 white Human Soldier creature token.
Whenever you cast a blue spell, scry 2.
Whenever you cast a red spell, Aragorn deals 3 damage to target opponent.
Whenever you cast a green spell, target creature gets +4/+4 until end of turn.

Island

Command Tower

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

Mountain

Forest

Exotic Orchard

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