ahm first of all this is not cheat i think its a glitch....
1) have 3 dummy accounts...
2) have the tavern...
3)recruit your dummy accounts
4)open your dummy accounts and accept the request...
5)open your account and get the reward get the MEDIEVAL DRAGON!!!1
6) sell it for 200k..
7)repeat steps 1-6 until satisfy...
thanks if helps...