The account-wide progression metric introduced 2026-05-26. It sums every card's level (+5 per Evolution and Hero form owned); crossing Collection Level milestones grants rewards such as Gems, Wild Cards, banners, tower skins and Evolution Boxes.
Replaced the old XP-based 'King's Journey'. Milestone rewards begin at Level 20, then every 10 levels to 1500, then every 5.
It's the sum of every card level you own, plus 5 for each Evolution and each Hero form unlocked. Upgrading anything moves it — which is the point: it rewards the whole collection, not just your main deck.
Removed in the May 26, 2026 update. King Tower Level is now driven by how many cards you've upgraded to given levels, and Collection Level took over as the account-wide progression track with milestone rewards from Level 20 on.
