On topic regarding the deck: I’ve been put that deck for like 4-5 weeks. It gave me quite good defense win ratio, around 0.40-0.45. I consider any deck that can pull above 0.33 win ratio on defense is a good defense deck. And I value defense wins as much as I value invade wins. First week, it was only couple players who copied it. But then more players lose to this deck then they copied it too weeks after.
That deck is very simple for stupid AI to play. If player ignore skulls, then AI will take it with chance of instakill top troops and +3 attack and life to whole AI troops. Would you take the chance?
If player then take skulls, he just waste his turns and the AI will just pick brown or purple as the banner set to it. 2x Mana surge from either one of those color is enough to fill BD. BD cast, usually first troop dies. Then 2nd troops. Wraith apply frozen and death mark repetitively. Even if you survived whole board of skulls and death mark, it’s usually very hard to comeback from that. Meanwhile Famine and Courage just chill there and be a good cheerleader.
About repetition I think it’s just because most of high level PvPers are playing at the same hour. So you’ll often see them in your PvP list. I usually get more variety of opponents at 11AM-3PM my time because it’s still early morning in Europe and late night in US.