(→Known Users: after doing some research, I found that he clearly doesn't have anything remotely close to this. All his power comes from magic absorption, and his own power is to weak to qualify him for this page.)
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 (Marvel Comics) magical abilities defy limitations and understanding, puzzling even the Sorcerer Supreme.
Wiccan (Marvel Comics) can manipulate vast amounts of magical energy for variety of effects.
Dormammu (Marvel Comics)
The Ancient One (Marvel Cinematic Universe) has tremendous skills in magic and sorcery.
Ryner Lute (Legend of Legendary Heroes)
After rejoining the other half of his soul, Blue (Saga Frontier) gained mastery over all forms of magic
August (Fairy Tail) is known as the king of all magic, and as such possesses mastery over all forms of magic near and far and old and new.
Grants to her power Infinity, Merlin (Nanatsu no Taizai) can use any magic no matter how powerful it is and make it last for eternity.
Wizard (Valkyrie Crusade) is magician who uses all types of magic.
Scathach (Valkyrie Crusade) the goddess of magic and melee.
Solomon (Magi the Labyrinth of Magic) is the most powerful magician of Alma Torran, able to use magic so advanced he created the 72 Djinns along with an entire new world.
Uraltugo Noi Nueph (Magi the Labyrinth of Magic) is a genius magician who has invented unique and powerful forms of magic and invented the Metal Vessels, the most powerful magic weapons ever created.