-
You can manage & track your card collection and decks once you create an account and login.

How do Soundwave and Blaster decide who gets to start with the Mini-Cassette under them, for both start of game and Recover Cassette?

You choose where the Mini-Cassette goes.
Source: Wizards of the Coast (2019-08-09)    【Link to Ruling】
Tags: Blaster, Communications, Blaster, Communications, Soundwave, Communications, Soundwave, Communications