I love this deck because apart from Magnifica, the deck is so affordable!
Exosister is an anti-GY strategy which utilizes Rank 4 XYZ monsters to control the game and punish the use of the Graveyard! If an opponent tries to move cards out of their grave, you get to XYZ summon on their turn! Since you don't use your own GY you're free to play brutial cards like Dimension Shifter to skip your opponent's turn and then destroy them with powerful cards like Exosister Magnifica.
This deck would be much cheaper without Magnifica, but it is a price we have to pay for power. If you want to upgrade this further, you just need an extra copy of Exosister Magnifica to improve things a lot.
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