You can only use this effect of "Magnet Warrior Sigma Plus" once per turn
As you can see, I decided to go for a consistent decklist, playing 6 gadgets plus multiple Photon Thrashers
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8 loyalty Player 2 - During his or her upkeep, Player 1 uses Teferi, Master of Time to use its first ability to +1 and Loot
She effectively draws you three cards for each Dragons Approach you cast, and shes just the card advantage engine you need to keep your deck consistent
[Note 1] [Note 2] The player's Deck Master typically starts the Duel visible (with the exception of Leichter's "Jinzo", whose identity was disguised, and Noah's "Shinato's Ark", which only manifested when Noah revealed its first Deck Master ability), but they have no practical function for a Duel while in this state, other than their Deck Master ability