Mulligans
General Mulligans
Any good controlling tools will do the trick, or early game stuff
You can change it by adding more spells and removing a few dragons. This focuses on using Dragons and Hero Power to control. Once your opponent has no response, Coldarra Drake+Fallen Hero*2, and 10 Hero Powers next turn can deal 30 damage to face. Any other reasonable things, like Deathwing, Dragonlord to which opponent has no response, works well too. If you Discover Big spells or Dragons, that works well too.