You could try High-alching from Smarthuiyuan's blog
I'm f2p, but you may consist of p2p suggestions too because I could become a member soon. Besides Crumble Undead, what are some other good spells to RS gold train magic? It can be any type of spell, but I am looking for cheaper and effective ways to train. . .So the cheaper and the faster the method the greater! Since im training mage in f2p atm lol... that I can assist you. Crumble undead could be used in case money isnt that big of an issue for you but it is not the fastest method.
You could try High-alching but you'd need to find in thing on f2p and that's hard lol. You might camp at G ex buying things or in banks in pvp worlds to purchase mith and addy armor out of pkers. The method I recommend is truely superheating: You can buy all the supplies, superheat and market them back..sure. .you will lose some cash, but its quick exp and it gives smithing exp aswell.
You could also go to the mining guild and superheat mith bars if you dont have that much money..or should you wish to keep some money... its nice exp, and pleasant money... of course, you can also superheat silver pubs... but if you are superheating... you will have to keep a close eye on the G ex graphs so that you can see whats great for superheating..and RuneScape gold buy if to exchange things.
The Wall