Tip 1
Learn all the combo effects and synergies to utilize the chesses.

Tip 2
Determine your team combos (Ex: Goblin - Assassin, Knight - Troll, Warrior, Mage, etc...). You should change your build depending on the situation (Ex: If you want to go Goblin - Assassin build but 2 or 3 people are building that team/Your rolls are pretty bad and have a lot of unnecessary cheeses - You should change to another combo).

Tip 3
Buy things you need to buy for your future team. You can buy some heroes that is not for the combo you wanted but can help you survive early game, and can sell it later.

Tip 4
From round 7 you must not buy anything unless its really necessary,if you do that, in round 14 you will have 50 golds to maximum the interest golds each round (+5 gold), you will have a really good economy afterward to build your team. Don't let your gold drop below 50.

Tip 5
In early game you shouldn't roll.

Tip 6
In mid game you should roll max is 3 times for 1 round to not hurting your economy. The rest of gold should go for leveling up your courier.

Tip 7
In late game spend all your gold for courier to level max and rolls for last pieces of combo you need.