First, I bought a couple of Reward Cards that recently went out of print, but that I really wanted to add to my collection. These are Nightmare Lv. 6 and Charlok Minotaur Lv. 6.
Now I will wait until the new Reward Cards get a little cheaper. I have seven favorites, so I'll try to get my hands on them.
Right now my deck is pretty focused on earth and a bit on water.
I would love to have a high level death deck.
My next goal is to buy as many pre-sale packs as (financially for me) possible.
I would be extremely happy to get Chaos Legion airdrops. The next step is definitely to invest in 1-2 high level summoners from Chaos Legion.
After all that I would be very happy :D

Ign: @toheadi