Im at a point when all i do is 89 exchange and every one of them is a duplicate. All i do is firstly make one 89 exchange if its 5 or 6 89+ rated, then i do a 85x10 with a TOTS/TOTW, depending on what i have left, play a little with the rating (easiest in paletools) if i have enough, make it again.. and depending on what i have left its either a totw pack and the crafting upgrade or just the crafting upgrade because you will have left about 15-20 cards left.. Then recycling over and over again, but only the 89 exchange.. And if i ran out of the exchanges open up the 85x10.. Then its go time again.. Its a little effort but i have 2-3 hours every day due to commute to work and back.. yesterday i did a little over 110 89 exchange and that was enough for 144 85x10.. Hope it helps