This is in line with the definition of magic given on the Marvel wikia:
is the practice of utilizing certain universal energies and extra-dimensional forces whose nature is beyond the scope of the technologically-oriented science of all known sentient races. It is often used to simulate other powers, such as reality warping, mind control and elemental attacks.
Sources of Magical Power:
- The mental and spiritual powers that mystics and sorcerers develop for themselves (psionics, chi-manipulation, astral projection, thought-casting, etc.)
Ambient Magical Energy of the Universe
- Magicians can tap this power for many effects, such as teleportation and energy bolts. By definition, this is derived from Eternity
. These generally involves actual casting of spells and may be limited to the main dimension learned and may not work in others.
Extradimensional Magical Energy
- powers gained through the tapping of extra-dimensional energy and by invoking entities or objects of power existing in mystical dimensions, with different physical and magical laws, tangential to our own. Unlike the first two, the entities invoked generally have a say in how or if the power is used.
- Magic may also come in the form of items imbued with power, such as the Crimson Gem of Cyttorak
. These are often created by powerful sorcerors and exter-dimensional entities and vary in function and power.
Loki is listed as an example of someone who can use magic.
The wikia entry for Malekith says that he taps "mystical energy", which I suppose falls under the category of "Ambient Magical Energy of the Universe" listed above.