I recently created this deck and it's helping me rank up.
In the early turns, try to get a bit of map control by playing Lizard and using the carnage/deathlok combo. From turn 4, try to counter the opponent (Enchantress/ Hobgoblin/ Shang-chi); and on turn 6 u have to predict the opponent and use Leader to copy his move. If you played well it's easy cubes.
Cosmo and Armor are heavy counters.