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If I attack with a character that is equipped with Battering Ram and deal damage to a Triple Changer, does my opponent get to choose the mode they change to or do they have to change from Alt 1 to character and vice versa.

Your opponent can choose which mode of its other modes to flip to.
Source: Wizards of the Coast (2019-07-12)    【Link to Ruling】
Tags: Battering Ram