Cake Master is one of the two skins released in one part of the Birthday Bonanza offer. It could be purchased on an individual basis using game coins in late July 2021.
Cake Master could be purchased in the Skins Shop under the 'Birthday Bonanza' tab for 3500 coins. It was available for a limited time and may not return in the future.
Details of this offer can vary depending on location, platform or time.