What did I find of relevance:

Lvl 7 times 34 (31 actually, the game crashed)
1 rainbow 3*, 2 souls 3*(one with carriage rider, yay)

Lvl 8 times 3
Nothing

Lvl 9 times 3
Nothing

Lvl 10 times 6
Nothing

Of course lots of gold, xp shards, 1&2* evo shards