We start with 300 coins. We can collect 600 coins every 8 hours = 18300 in total (coins from quests or freebies are not included) For collecting times check this.
Who never played a maze island should check this: Maze Island explanation for beginners
Dragons:
- Oil Point new #1027
- Chinese #132
- Tempera new #1028
- Da Vinci #311
- Gouache new #1029
- Experimental #237
- Aquarelle new #1030
- Elements #237
- Brawl new #1031
- World Cup #913
- Graffiti Artist #954
The pictures show path costs and key locations with extra costs. Make sure to make a "backwards" list of the dragon you want. See what key it needs and what key the dragon needs that has that key on the path and so on. Plan proper before you start something and get nothing in the end. For example: For Gouache it would be: needs Da Vinci step 9 (540 coins), Da Vinci needs Chinese step 9 (190 coins) and Chinese needs Oil Paint step 7 (285 coins). So you have 540+190+285+8320(path for Gouache) = 9335.
Elements, World Cup and Graffiti Artist will show up on a timelimited path and need no keys.
Good luck.