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.
If you cast a spell that's multiple colors, more than one of Aragorn, the Uniter's abilities may trigger. In that case, you choose the order in which the abilities are put onto the stack.