Valk Invis

How this deck works: By putting valkyrie next to royal ghost and giant skeleton in the back as distractions, ranged minis without infinite range will move up and the valkyrie will be able to attack them.
Before moving onto buy options, why countess? Well countess cannot take much damage and requires energy, so making her invisible, she can get some damage on the flank.
Round 1: You need royal ghost since this round valkyrie won’t be your carry. You can go giant skeleton with royal ghost or giant skeleton with valkyrie.
Round 2: You try to go for valkyrie and royal ghost. If it doesn’t work, you can go giant skeleton with some backline support
Round 3: This is where you shine: By this point you need a giant skeleton, a 2 star valkyrie and a royal ghost. Create your lineup and win this round. You have 3 elixir left, spend it on a 2 elixir mini and put it in the back
Round 4: Now that you have your lineup, you need to upgrade royal ghost since valkyrie dies very quickly after invisibility runs out. Upgrading him to 2-3 star from now and he will be very viable.
Round 5: You try to play for spear goblin’s 1st upgrade or ice wizard’s 2nd upgrade as they will benefit you in terms of support and early damage. Ice wizard’s 3rd ability is also useful in this deck as it can work like the giant skeleton.
Round 6: Anything is good but you should definitely have a 2 star valkyrie, a 3 star royal ghost, a 1 star spear goblin, a 2 star ice wizard and a giant skeleton