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I have Trypticon and Full-Tilt on the battlefield untapped, with Wipeout and Brunt in the KO area. I play Relentless Invasion, returning the two KOed bots to the battlefield and attack with them. Am I then required to attack with Trypticon or Full-Tilt?

If your opponent is entirely tapped out, you must attack with both characters. If not, you can attack with one or the other (not both), but you don’t have to.
Source: Wizards of the Coast (2019-11-22)    【Link to Ruling】
Tags: Trypticon, Assault Base