The Rebel Clash Build & Battle Box is a special product given to participants at the start of Prerelease Tournaments for the Rebel Clash expansion. These tournaments were set to be held on the two weekends prior to the release of the expansion: April 18-19, and April 25-26, 2020, but due the COVID-19 pandemic all events were cancelled. Select retailers still received the boxes and were allowed to begin selling them April 18, 2020, with a wider retail release on May 1, 2020. Each box contains a random set of predetermined cards designed to enhance the experience of the Limited format events in which they were initially distributed.
Each Build & Battle Box also included an additional random group of 4 (or 5 if you received the Flapple or Coalossal group) of the following Supporter cards, with no more than 2 copies of a particular Supporter.