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If there are two cards left in my deck, and I attack with Autobot Cosmos, will his ability trigger?
Yes. You reshuffle your scrap pile into your deck as soon as the deck is empty. In this case, Autobot Cosmos will attack, youll flip up the two remaining cards in your deck, and the defender will be KOd (assuming it has 12 starsor fewer). Your opponent wont flip any battle cards for the attack if their character is KOd this way.
Source: Wizards of the Coast (2018-10-11)    【Link to Ruling】
Tags: Autobot Cosmos, Recon & Communication