Jobless: After Transmigrating, I'm Affine to Every Type of Magic

[No idea what the setting is + transmigration + mage template + world fusion + multiple heroines] After accidentally transmigrating to a world of swords and magic, I awaken the Poisonous Milk Powder System and acquire the skills of every type of mage. As long as I level up, I can learn every skill. Magic? What can I say? I became a grand mage. Swordsmanship? See this spear? I can transform straight into a melee mage. Skill god? You think I’m afraid of your hundred-plus skills that work across every class? Come on, if you’ve got a problem, let’s fight!