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Many decks can create artifact tokens multiple times a turn, and this construct is super easy to slot in

You just used a cards downside to make your artifact uncounterable

As far as cards that can slot in in other builds, We Ride at Dawn is a great one for Convoke decks, especially because it helps re-cast a Commander but also provides bonus creature tokens to pile into the melee

Lightning Helix is comparable to Incinerate - another very strong cube card

The main ability here though, is that if another Creatures enters the battlefield under your control, Purphoros deals two damage to each opponent

Oculus Whelp ( R ) - This dragon, who appears to have seen better days, is a 3 mana card that replaces itself when it dies