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Mewtwo Gold Star from the Pokmon TCGs Holon Phantoms set is, unsurprisingly, also incredibly popular, with TCGplayer putting its market value at $380

Plus, you get to exile artifacts, creatures, enchantments, and graveyards (or any combination thereof) rather than just destroying permanents and sending them to the graveyard with Austere Command

Finally, its a form of massive card advantage since you can discard the lands for effects like Cathartic Reunion or Seismic Assault

Guidelight Optimizer generates blue mana for you to cast artifacts or activate any ability, being more in line with the Powerstones from The Brothers War

Id consider it if it was on all of them