As I said before:
1) Last ban list update only limited R cards.
2) then EX structure packs became purchasable with gems.
3) They have also increased the drop rate of gems. They also renewed the dueling stamps pretty fast. What does that tell you? Duel Links is doing pretty well.
Which is the strongest deck right now?
Answer: Koa'ki Meiru.
You can get it for free.
Anonymous
Dune