when I felt that 77 doesn't synergize all that well with 49, I tried getting another 7 in hopes of making a deck of 49s and many 11s. 
but I'm pretty sure this ~dialogue is wrong (suspected it long ago but remember loads of minor stuff I didn't bother pointing out). oh well, I'll just make deck of three 77s, and maybe test out 7^3=343 to plan ahead in case more mining battles get added. I was listing loads of mini tests in gsheets and just thought to have 13 remaining to use up, or use 43 effect before playing x. oh and, 73 7...