The Dragon Ball Super Card Game is a trading card game with an eternal format, which means that none of the released cards rotate.
The Zenkai Series has been successful since its launch. In contrast to the Unison Series, Zenkai didn't overshadow the prior mechanics and provided a new opportunity for old archetypes to shine once again.
The Zenkai Series Set 04, Wild Resurgence, went even further by dedicating all the Black slots to support old Leaders like Crimson Trunks, Mechikabura, Towa, and Mira.