I think the major issue is lack of creativity personally. I don't mind a little risk vs reward. I actually enjoy a tough challenge knowing that only a select few members will have the cards. However the card is rubbish. Recycling old cards skills for such a high risk for a mediocre at best card.
I think the new dungeon is as boring as the card itself. At least with apocolypse dungeons you went a new route. This feels like apocolypse dungeons recycled with boss cards and waves changed. I have never played any other game that has been such a money sink as dragon era and am dissapointed at your laziness time after time. What are you providing for the veteran player?
I have one card left to draw from gem recruits or guild shop untill this game offers nothing new for me and that in itself is dissapointing enough. Knowing that when we upgrade our guild shop shortly I will take no pleasure in it due to lack of content this game has to offer and the main light on horizon for me was this round of time limited dungeons. But yet again I am dissapointed.
Poor play on your behalf playmage.
/rant over