No, Powerstones cannot be used to pay for commander tax unless the commander you're casting is an artifact
McDonald's has long capitalized on the success of the card game and released a lot of exclusive promo cards in 2024, but Japan hasn't had promos in a long time
Only playing 8 energy leaves plenty of room for overattaching, or putting energy in the wrong spot with no way to fix it, so focus on what the next best attacker is given the board state and likely plays from your opponent
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All Dark Synchro Monsters have been released as regular Synchro Monsters, with either regular (but highly specific) Synchro Summoning requirements or a special Summoning condition that simulates a Dark Synchro Summon
Some creature types like dragons, dinosaurs, or giants tend to be big and expensive, so adding in a few low mana value changelings like Changeling Outcast or Masked Vandal can help enable typal synergies quickly
