PLAt_PESto

What to upgrade next

1. 
   GraveyardLevel 9 → 10In 3 of your 10 best decks · 1.2 levels below those decks' average
2. 
   FurnaceLevel 10 → 11In 4 of your 10 best decks
3. 
   Barbarian BarrelLevel 11 → 12In 5 of your 10 best decks
4. 
   KnightLevel 10 → 11In 4 of your 10 best decks
5. 
   Goblin HutLevel 10 → 11In 3 of your 10 best decks

Based on the 10 best popular decks you can already play. The API doesn't include gold costs, so this ranks by how much an upgrade helps those decks, not by price.