- How do you calculate the hero level?
- Buying first level II card costs 2 coins. How much does the second level II card cost?
Note that heroes have levels, but cards have tiers.
The cost of level-up depends on hero's level, not on the tier of the card.
Each card you buy costs one more coin, starting from 2 coins (this is mentioned both in rulebook and on the player mat).
You have to buy all the tier II cards before you can get a tier III one. Once you get all of them, you get an ultimate.
So, your first tier II card will cost you 2 coins and your second tier II card will cost you 3.
When you purchase the second level 2 card, you will be level 3. So it costs 3 gold. And so on. When you purchase your first level 3 card, your hero will be level 5.