I'd like to join but not quit my current guild so I was thinking that I could just make an alt account and play on both at the same time to hit the 1500 seals if that's all you require.
Building a team just to grind ~150 single trophy fights wouldn't take long to build and would quickly ramp up to 2 and eventually 3 trophy fights. (Thinking of joining my current guild for a week first to get enough resurces to get a few mid tier cards and to demo a bit how dual-playing works in reality.)
I can pull this off only if the requirement doesn't include that 300k gold a week anymore because I would need to get everything out of the new account to make it enjoyable and actually worth the effort ^^"
PS. If this sounds fine, I'll be back with my experiment report after a full week from the next reset. Prolly on 22nd or 23rd.