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If I have Static Laser of Ironhide equipped to Ironhide when I combine the Sentinels into Optimus Maximus, and keep it, does he take the damage penalty, or does he count as Ironhide since Ironhide is part of him?

Optimus Maximus is not Ironhide, so he would take the damage.
Source: Wizards of the Coast (2019-04-22)    【Link to Ruling】
Tags: Static Laser of Ironhide