It's one of the most recent decks to be released, but it has a very niche strategy
The mana produced by Altar of the Lost can only be spent on a highly specific subset of cards (flashback cards), only in a very specific situation (if they are already in your graveyard), and the soonest youre getting this mana is Turn 4 without accelerating Altar out early
All rules for the command zone and color identity still apply as deckbuilding restrictions in the Arena singleton format
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Additionally, Dizzy Punch, a single energy attack, can often get you a free KO when you roll two heads, fainting most of the common basic Pokemon