I played Eternal when market system doesn't exist, my last new card pack was Fall of Argenport. It was pretty hard to get used to new cards and I have no enough shiftstone to follow trend deck
so I modified my retro skycrag aggro with only one any legendary card(+ Jekk lol), It works pretty well in gold tier, not sure for above though
If you have enough card from old pack, you only need some rare card
Blazing Salvo Tota Pioneer Phoenix Stone
or, if you have not enough shiftstone, just remove Salvo & Phoenix, add some damaging spell likeMortar Obliterate
and spell which can destroy relic (Grenarender Slag
recommend to get Jekk or Vadius for first card u draw.