User of this power has unlimited access to all forms of magic and other mystical and supernatural forces. They can bend, break, and even create natural laws, distort the fabric of reality on a cosmic scale, perform unbelievable miracles, and create things without limit. Users are also immune to all opposing magic and can even break through all outside mystic defenses.
In short, the user seems all-powerful at first, but is actually at a nigh-omnipotent level.
The Mage of the Beginning (Mahou Negima Sensei) possesses full mastery of all types of Magic.
Because of his magical linage and his tremendous magical power, Kazuki Shikimori (Maburaho) is capable of doing anything with his magic from manipulating time, to creating pocket dimensions, and even teleportation.
Madoka Kaname (Puella Magi Madoka Magica), due to the power of her wish as a magical girl, gained command of all magical powers, becoming a goddess.
Finn the Human (Adventure Time) as the Ultimate Wizard has all possible magical powers.
The Scarlet Witch's magical abilities defy limitations and understanding, puzzling even the Sorcerer Supreme himself.
Ryner Lute (Legend of Legendary Heroes)
After rejoining the other half of his soul, Blue (Saga Frontier) gained mastery over all forms of magic