Board Thread:Game Discussion/@comment-24124188-20131102234812/@comment-5158113-20131103000737

Nope, after the 15 wins, you will be getting 2 pieces per win afterwards.

So after Win 15, you will get 50 more pieces after Win 43.

There is no way to reset the levels, so that's the only way you can earn the pieces, or else you have to spend alot of gems and Summon the monsters.

Hope this helps! ~