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Follow the rules of the Commander format (each player starts with 40 life, games are played with a shared draw deck, etc.) to play the game using your deck.

Attribute: Description: (This card is also always treated as "Legendary Dragon Timaeus".)Target 1 "Dark Magician" monster you control

So to power your deck down, you can consciously limit your deck - removing interaction, increasing the mana cost of your ramp (for example swapping a Mana Crypt for a Hedron Archive) or removing it, and increasing how easy your game plan is to interrupt (which will reduce its potency)

Pokmon Terastal Festival ex Booster Box Japanese High Class Set