Aragorn, the Uniter is a powerful commander. This deck works by using his unique abilities to take advantage of all of your spells. Casting each color in the deck gives you access to a different triggered ability.  The deck also has a Humans sub-theme, one of the most powerful tribes in Magic.

White spells create 1/1 token humans

Blue spells let you scry 2

Red spells deal 3 damage

Green spells give a creature +4/+4

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, the Uniter deals 3 damage to target opponent.

Whenever you cast a green spell, target creature gets +4/+4 until end of turn.