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Say I have 21 cards in hand, I flip Autobot Cosmos and scrap my entire hand and then draw the same amount. If I only have 6 cards in my deck, do I draw the 6 cards, reshuffle because I had already scrapped my hand and then draw out 15 more?

Yes.
Source: Wizards of the Coast (2019-02-18)    【Link to Ruling】
Tags: Autobot Cosmos, Recon & Communication, Play