Instead of asking for buffs u can also buy potions, some are cheap some very expensive. 
Only buy them if u really need them.

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Usefull offensive potions :
- Berserk lvl-175. Between 2K and 10K gold
                                   
- Berserk lvl-200.Between 10K and 20K gold
                                 
- Berserk lvl-300. Between 75K and 200K gold
                                
- Wither lvl-350. Between 500K and 750K gold
                                
- Enchantend Weapon lvl-1000. Between 200K and 500K gold
                                
- Dark Curse lvl-200. Between 175K and 250K gold
                                
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Usefull defensive potions :
- Constitution lvl-250. Between 50K and 125K gold
                               
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Usefull special potions :
- Librarian lvl-200. Between 125K and 200K Gold
                                   
- Find item lvl-250. Between 15K and 40K gold
                                    
- Find item lvl-1000. Between 300K and 500K gold
                                  
- Adept Learner lvl-125. Between 1K and 2K gold
                                   
- Doubler lvl-100. Between 5 and 15K gold
                                   
- Doubler lvl-450. Between 400K and 800K gold
                                   
- Animal Magnetism lvl-150. Between 1K and 5K gold