Cast Hangarback Walker by paying 1, causing it to enter the battlefield with a +1/+1 counter on it.
Activate Together Forever by paying 1, targeting Hangarback Walker.
Activate Ashnod's Altar by sacrificing Hangarback Walker, adding CC.
When Hangarback Walker dies, Together Forever triggers, returning Hangarback Walker from your graveyard to your hand.
Repeat.
This clever loop turns Hangarback Walker into an endless engine for profit, fueled by Jhoira's Familiar making your artifact casts free. By utilizing Ashnod's Altar, you sacrifice the Walker to generate colorless mana while triggering its death ability to flood the board with Thopter tokens. Meanwhile, Together Forever acts as the crucial recursion piece, using that generated mana to catch the Walker as it hits the graveyard and bounce it right back to your hand for another iteration.