Aragorn, the Uniter + Whitemane Lion + Phyrexian Altar + Primal Vigor

Aragorn, the Uniter

Whitemane Lion

Phyrexian Altar

Primal Vigor

How it works

1. Cast Whitemane Lion by paying 1.
2. Aragorn's first ability triggers, creating two 1/1 Human Soldier creature tokens.
3. When Whitemane Lion enters the battlefield, it triggers, returning itself from the battlefield to your hand.
4. Activate Phyrexian Altar twice by sacrificing the Human Soldiers, adding 1.
5. Repeat.