I have the same idea with the Wizard. It deals more damage than the Baby Dragon but costs one more Elixir, though. So, it actually pretty much the same As for the Freeze spell, it just an alternative, in case your Balloon faces some monsters.
All the worked card is optional, though. Hence, you have to decide what cards that suits your play style. The must cards are just the Balloon and Clone. The rest? It’s up to you.