Every Epic Seasonal has all 4 of their respective Seasonal Decorations as their likes. Each set* of Seasonal Decorations costs a total of 3.750.000 Coins and 75 Diamonds. Now all that's left to do is count how many sets of these you have to buy!
*Epic Jam Boree is an exception. Its Likes are the 1st, 2nd, 3rd and 11th Anniversary Monument, which all cost a few thousand Coins. Chump change.
Plant island - 1
Cold island - 1
Air island - 2
Water island - 1
Earth island - 1
Fire Haven - 1
Fire Oasis - 2
Light island - 1
Psychic island - 1
Faerie island - 1
Bone island - 1
Ethereal island - 1
Magical Sanctum - 1
Shugabush island - 1
Seasonal Shanty - 14*
Amber island - 1
Mirror Plant island - 1
Mirror Cold island - 1
Mirror Air island - 2
Mirror Water island - 1
Mirror Earth island - 1
Mirror Light island - 1
Mirror Psychic island - 1
Mirror Faerie island - 1
Mirror Bone island - 1
Total - 41
153.750.000 Coins
3075 Diamonds
Ah well. That's not too bad.
