In most formats, you'll only be allowed a total of four of either card, while in Commander it will still be just one
While this may not sound all that impressive given that he basically comes with his own Invocation of Saint Traft attached, and the idea behind Voltron is that it's the Commander that deals damage, I found that this ability actually synergizes well with Mace of the Valiant, a recently printed equipment that gives larger bonuses when a creature enters the battlefield - something that will happen each time the Geist attacks
It really comes down to whether or not you think its best to have an enabler or a payoff as your commander, since Szarekh mills you while Imotekh rewards you for getting stuff out of your graveyard once its milled
Scrappy Survivors is the perfect deck for just that, chock-full of Auras and Equipment to make your creatures tougher
There are many creatures with the ability Whenever this creature deals combat damage to a player, do X, nicknamed the saboteur ability