The highest ranked achieve in a season will be saved in quest log and will receive the rewards even if a person drops the rank.
Rank 15 seems most optimal for most casual players that don’t feel like grinding Hearthstone but enjoy collecting.
Devs told us that rank 5 chests are the highest tier and that every rank after rank 5 only gives slightly more dust but thanks to the reddit community and the ”bug” that allows you to get chests on other servers if you haven’t played there this season, we are now 99% sure what rewards you get for each rank.
Rank 20 – 1 golden common card, 5 dust
Rank 19 – 1 golden common card, 10 dust
Rank 18 – 1 golden common card, 15 dust
Rank 17 – 1 golden common card, 20 dust
Rank 16 – 1 golden common card, 25 dust
Rank 15 – 1 golden common card, 1 golden rare card, 5 dust
Rank 14 – 1 golden common card, 1 golden rare card, 10 dust
Rank 13 – 1 golden common card, 1 golden rare card, 15 dust
Rank 12 – 1 golden common card, 1 golden rare card, 20 dust
Rank 11 – 1 golden common card, 1 golden rare card, 25 dust
Rank 10 – 2 golden common cards, 1 golden rare card, 5 dust
Rank 9 – 2 golden common cards, 1 golden rare card, 10 dust
Rank 8 – 2 golden common cards, 1 golden rare card, 15 dust
Rank 7 – 2 golden common cards, 1 golden rare card, 20 dust
Rank 6 – 2 golden common cards, 1 golden rare card, 25 dust
Rank 5 – 2 golden common cards, 1 golden epic card, 5 dust
Rank 4 – 2 golden common cards, 1 golden epic card, 10 dust
Rank 3 – 2 golden common cards, 1 golden epic card, 15 dust
Rank 2 – 2 golden common cards, 1 golden epic card, 20 dust
Rank 1 – 2 golden common cards, 1 golden epic card, 25 dust
Legendary – 3 golden common cards, 1 golden epic card