Spend all your reward points and get as much MP as possible and transmutate as much legendary cards as possible. After April 15th, they are going to be twice as hard. If you have limited RP, check each and every node and find where you have access to MP in the shortest distance. It is a hard and long process, but it is worth it. I navigated to many nodes and unlocked the MPs from the nodes which have MP access very close.
Also, don't transmutate Epic or any Bronze cards as they are going to get cheaper. Also, if you have kegs, open them all (spending all ores and buying kegs may not be recommended as you may need to buy kegs when the expansion hits. It is up to you). Since the chance of getting a legendary from kegs are small, and assuming you don't get much legendaries, getting all other rarity is a profit when they get auto milled. Since, after 15th if you open your kegs and get bronze or epic gold cards, auto-milling them is going to give you lesser MP.
After spending nearly an hour or so, I have at last done it. No Legendary premium unowned! Good luck for your Reward Book grind.
Also, don't transmutate Epic or any Bronze cards as they are going to get cheaper. Also, if you have kegs, open them all (spending all ores and buying kegs may not be recommended as you may need to buy kegs when the expansion hits. It is up to you). Since the chance of getting a legendary from kegs are small, and assuming you don't get much legendaries, getting all other rarity is a profit when they get auto milled. Since, after 15th if you open your kegs and get bronze or epic gold cards, auto-milling them is going to give you lesser MP.
After spending nearly an hour or so, I have at last done it. No Legendary premium unowned! Good luck for your Reward Book grind.
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