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 loop transforms the humble Hangarback Walker into an engine of endless iteration, fueled by the mana-generating power of Ashnod's Altar. By using Together Forever's activation to shield the Walker from permanent death, every sacrifice on the Altar yields two colorless mana while triggering the Walker's own ability to leave behind an army of 1/1 Thopter tokens. Meanwhile, Voyager Quickwelder sits in play quietly reducing the casting cost of your artifact spells, ensuring you have all the economic efficiency needed to recast the Walker and keep the cycle spinning infinitely.