The card would be perfectly legal) and happens to go infinite with one of the most competitive Commanders in the game: Najeela, the Blade Blossom
This will trigger the abilities on several cards revealed for the new set, like Sarkhan, Dragon Ascendant, or the new Dragonstorm enchantment cycle, which care about dragons entering
Opening the Vault requires getting duplicates through packs, drafting, and/or individual card rewards: 900 common or 300 uncommon duplicates
Its a patient game, and players will be tempted to get her down before being able to protect her, but in a pod where opponents are packing hella removal, youll be paying your (commander) taxes a bunch
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This could lead to some memory issues in tabletop, but when the difference between the two modes is this massive, Im optimistic that it wont be a big deal