Mulligans
General Mulligans
The most important thing to remember is that you should not put all your cards as soon as you can. Always try to keep one or two cards in your hand. In other words, if you are in turn 3 and you have a card that costs 3 mana (eg druid of the scythe) play this card rather than playing a card costing 1 and another costing two mana. The only exception is when you fall against an aggressive deck where the goal will be to take control of the board by posing more creatures than your opponent.
A token druid low cost (2000 dust)
This deck must allow you to reach at least the rank 10. I even think it is possible to go much further with (rank 5).
It is quite easy to use and fits well in the meta which is rather unstable because of the rotation.
The most important thing is to do your mulligan well and try not to play too many cards each turn. In other words, you must respect the “curve”.