To get more Magicka in The Elder Scrolls IV: Oblivion, here are the most effective methods:

Increasing Maximum Magicka

• Raise Intelligence Attribute: The primary way to permanently increase your maximum Magicka is by increasing your character's Intelligence when leveling up. Each point in Intelligence increases your Magicka by 2 points

• Choose Race and Birthsign Wisely: Selecting a High Elf (+100 Magicka racial bonus) and the Atronach birthsign (+150 Magicka) can significantly boost your base Magicka. However, the Atronach sign also causes stunted Magicka regeneration, so some players prefer a Breton Mage for balanced power

• Complete Quests and Obtain Items: Certain quest rewards and items can increase Intelligence or Magicka. For example, the Necromancer's Amulet (+158 Magicka), Scales of Pitiless Justice (+2 Intelligence), and the Birthright of Astalon (+50 Magicka) can be acquired to boost Magicka further

• Enchant Equipment: Use Transcendent Sigil Stones to enchant multiple gear pieces with Fortify Magicka (+50 Magicka each). You can enchant up to 9 items, potentially adding +450 Magicka. Combining this with other enchanted items and rings can push your Magicka to over 1000 points

Improving Magicka Regeneration

• Increase Willpower Attribute: Willpower governs the rate at which Magicka regenerates. Investing points in Willpower when leveling up will make your Magicka recover faster

• Enchant Gear with Fortify Willpower: Enchanting items to boost Willpower also improves Magicka regeneration, which is often more impactful than just increasing total Magicka

Temporary and Exploit Methods

• Potions and Buffs: Drinking Fortify Magicka potions or casting Fortify Magicka spells temporarily increases your Magicka pool. These effects can be stacked for powerful short-term boosts

• Infinite Magicka Glitch: There is a known glitch involving creating a custom spell that fortifies Intelligence and Magicka, combined with a Drain Magicka effect on self. By repeatedly casting this spell and using an enchanted item with Drain Magicka, players can achieve extremely high permanent Magicka values (e.g., over 12,000), allowing for casting very expensive spells

Summary

• Focus on raising Intelligence for max Magicka.
• Boost Willpower for faster Magicka regeneration.
• Use enchantments on gear with Fortify Magicka and Willpower.
• Obtain powerful items and quest rewards that increase Magicka or Intelligence.
• Consider temporary buffs or the infinite Magicka glitch for extreme cases.

This combination of attribute management, enchanting, and quest rewards is the best way to maximize your Magicka in Oblivion