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Eight mana is a ton, but all the usual enablers, from Ugin, the Ineffable, Foundry Inspector, Forsaken Monument, Karn, Legacy Reforged, and Ultima, Origin of Oblivion help get you to that point

Concentrate with two different upsides - that is a banger

Furthermore, if the counterpart to the Exosister card you added to your hand is on the field or in the Graveyard, you can special summon that monster, so depending on your hand, it can also serve as expansion support

From the field , it can Special Summon any (properly-summoned) "Crystron" monster back to the field from the banish pile

As the record of failure to spread Clear Mind to people overlapped with the limit of his own lifespan, the result of his rampage claiming that he could not save the future with his humanity led to the disasters of Zero Reverse and Arc Cradle