The Scarlet Witch (Wanda Maximoff ) is a fictional character that appears in comic books published by Marvel Comics. The character first appears in X-Men #4 (Sep. 1963) and was created by Stan Lee and Jack Kirby.
Initially, the Scarlet Witch had the mutant ability to manipulate probability via her "hexes", which usually manifested physically as "hex spheres" or "hex bolts". Wanda has the ability to affect probability fields to cause an occurrence of various unlikely phenomena, including spontaneous combustion of flammable objects, rapid rust or decay of organic or inorganic materials, deflection of objects in flight, and disruption of energy transmissions or fields. These hexes were relatively short range and limited to line of sight. Casting a hex requires a gesture and concentration on her part, though the gestures are largely a focus for the concentration. Despite this precision, the hexes are not necessarily guaranteed to work, particularly if Wanda is tired or using her powers excessively. If overextended, Wanda's hexes can backfire, causing probability to work against her wishes or to undo previous hexes.
Doctor Strange also states to Beast that Wanda's one spell is of such complexity and strength that it has woven itself into reality and the world of magic itself, and that if he were to even to try to reverse it, all of reality would implode; the spell Wanda cast also affects even the alternate realities, strongly implying she was of sufficient power to permanently change the Multiverse itself, which is nearly unprecedented, even by cosmic entities.
As the spell causing Decimation only affected mutant-based powers, not mystic-based ones, in all logic, Wanda is still perfectly capable of wielding magic, even if her mutant hex-powers have been removed. Wanda has recently shown herself to be capable of projecting her astral form for considerable periods of time and achieving flight, intangibility and even teleportation of many people over continents and oceans without apparent exertion or effort.