Mage's Hand

Summary
Mage's Hand is an ability developed by Merlin to aid him in his endeavors, whenever he needs to do anything not involving magic. It allows him to temporarily gain any skill without any training, at the cost of not being able to use any other magic while he possesses that skill. The definition of skill is extremely broad, though it must be something that can truly be judged, so skills such as persuasion or charisma cannot be obtained this way.

Note: Merlin's skill at riding is a learned skill and not a result of the use of Mage's Hand.

Uses
The following skills have been used by Merlin at different points using Mage's Hand:

Swordsmanship- Used this to train Arthur.

Chemistry- Used this to decompose Rex Malibu's feathers.

Sewing- Uses this to create his cloaks and disguises.

Archery- Used this to kill several of Morgan's men when they attacked his tower in Camelot.

Spearmanship- Used this to turn his staff into a deadly weapon when all of his magic was countered by Morgan.