4. Merge & Upgrade Creeps

Each creep can be leveled up by merging duplicate cards collected by opening packs. The amount of duplicates needed will scale depending on the level of the creep. In aidditon, you need gold to complete the upgrade.

Duplicates needed per level

Level	Common	Rare	Epic	Legendary
lvl.2	2
lvl.3	4
lvl.4	10	2
lvl.5	20	4
lvl.6	50	10
lvl.7	100	20	2
lvl.8	200	50	4
lvl.9	400	100	10
lvl.10	800	200	20	2
lvl.11	1000	400	40	4
lvl.12	1500	500	50	6
lvl.13	3000	750	100	10
lvl.14	5000	1250	200	20