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If you have Trypticon untapped initially, and your opponents’ characters are also all untapped, and I play Relentless Invasion to bring back Wipe Out, Full Tilt and Brunt, since the effect of Invasion allows you to attack with them all, can Trypticon attack as well?

Yes. The attack granted to his three minions is in addition to your normal attack that turn.
Source: Wizards of the Coast (2019-11-22)    【Link to Ruling】
Tags: Trypticon, Assault Base