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It may be level seven, but getting it out on the Field is easier than ever these days when using the effects of other cards to summon it

[18] [11] Diva then activates "Cubic Wave", letting him target a "Cubic" monster he controls and a monster his opponent controls, increase the ATK of his monster by its original ATK and halve the ATK of his opponent's monster as long as "Cubic Wave" remains on the field ("Indiora Doom Volt": 2400 4800, "Lord Gaia": 3000 1500)

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But I also think DIY boxes run too many risks of not meeting enough of the criteria I need when considering a deck box

No stamp and no shadow