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For Relentless Invasion, do you have to have all three minions KOd or can you revive one or two of them?

They dont all have to be in the KO area. Whichever ones are there can be put onto the battlefield. Only the characters deployed this way go back under Trypticon at the end of your turn.
Source: Wizards of the Coast (2019-11-22)    【Link to Ruling】
Tags: Relentless Invasion