mega evolution japanese booster box Pokemon - Ninja Spinner - Collectibles sold as Pokemon M5 Mega Evolution Abyss

You can find this deck and plenty more on the PlayEDH Low Power Hub thats hosted by our good friends at Moxfield

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Stop Defense X SPELL Target 1 Defense Position monster your opponent controls

By the time it resolves, the mana costs in particular have already been deducted from your mana pool, so the mana you spent to activate Doubling Cube cannot be doubled by its ability.