yugioh salamangreat structure deck Yu-Gi-Oh! Official Card Game Duel Monsters sanctum shuffle it into the Deck Yu-Gi-Oh! Structure Deck - Soulburner

Sigma can revive itself from the GY if you have no monsters in the Extra Monster Zone (Circular can send Sigma from the Deck to the GY), Subtraction/Addition can Special Summon itself freely and Equation can revive a Mathmech monster

It doesn't matter Gavi was on the battlefield when the first card was drawn

Image credit: Goldin Auctions It was never originally sold and was only released as a prize in a 1998 illustration contest

Though this heavily serves red aggro looting decks, it also works well with black discard decks like Hashaton

Being a proactive one drop with no further investments required it is one of the better artifact cards you can use to support synergies