My recipe for better player retention:
- Offer and promote a draft mode with ghost cards and a cheap entry fee,
- Tournament is played in KO-System with 8 players,
- Create a set of specific reward cards which are SB and only usable as additional cards for this draftmode,
- Each participicant gets some of these rewards cards as prize, random bcx and random rarity like in reward chests,
- Winner gets main prize and runner up consolation prize funded by entry fee