I just got into it myself... I will wait for chaos legion packs to be sold publicly.
Buy a lot of them and open some.
I bought cards for 10$ and I can win bronze III easily. I just can not advance without collection power and I am not going to buy a stack of 100 shit cards @ 0.20$ just to advance to bronze II.
For now, I staked some SPS and I am selling the daily voucher.
RE: Splinterlands Investment Strategy Advice Request - Getting Involved After Missing The Gold Rush