Magica De Spell

"This time, nothing will stand in the way of what I want most in the world. (Poe: What? To turn me back into a man?) No! Scrooge McDuck’s old Number One Dime. It's first dime Scrooge ever made. It contains the psychic vibrations of every deal, every decision, every dollar Scrooge has ever made! Once I melt that dime and pour it into my amulet, I will be so powerful, not only will I be able to turn you back into my brother, but THE WORLD WILL BE MINE AS WELL! AH HA HA HA HA HA!  Sorry, I get carried away."

- Magica declaring why she wants Scrooge's Number One Dime.

Magica De Spell is one of the main antagonists of the Scrooge McDuck comic series as well as DuckTales TV series and its 2017 reboot. She is an evil sorceress who relentlessly seeks to steal Scrooge McDuck's Number One Dime, which she believes endows whoever owns it the power to become immensely wealthy and conquer the world.

In the Comics
Magica appears as one the main villains of the Duck universe comics and even appeared in Darkwing Duck as a major villain. She first appears in The Midas Touch in 1961 and had since appears in many other issues and other media.

DuckTales (1987 cartoon)
Like most witches, Magica has a pet (a dark crow named Poe, who was actually her brother, but was accursed and doomed to be a crow for all eternity). Unlike other characters, she believes McDuck's Number One Dime a magic medallion that grants its owner the ablitiy to earn all the money in the world. She plans on stealing the Number One Dime to create her own wealth that will make her the most richest and power person to achieve global domination.

DuckTales (2017)
See here.

Original
With looks that could kill, and a deep Neapolitan accent, Magica is not to be taken lightly. She has an evil lair located near Mount Vesuvius. She is known for being incredibly hammy and ostentatious, often giving long rambling speeches and not knowing when to stop. However, she is very determined, enthusiastic, dedicated, and staunch, stalking and watching Scrooge on her crystal ball and hunting him down relentlessly.

Reboot
During the first season, she keeps pressuring her niece into doing her bidding. When Lena finally tries to tell the Ducks the truth, Magica grows strong enough to possess Lena's body; not only preventing her from warning them but also allowing Magica to get even closer to Scrooge.

Donald Duck: Goin' Quackers
Magica appears as the secondary antagonist of this game, working for Merlock.

DuckTales: Remastered
In the game, Scrooge McDuck finds a secret treasure map and, being the greedy man he is, chases after them. Magica follows him behind the shadows, and after Scrooge finally collects all the treasures, Magica kidnaps Huey, Dewey and Louie and demands the five treasures, along with Scrooge's Number One Dime if he ever wants to see them back. Scrooge is forced to temporarily work together with Flintheart Glomgold to get through Mt. Vesuvius, where she awaits.

However, in the final level, Flintheart steals Scrooge's treasures and dime and gives them to Magica, revealing they have been in cahoots the whole time. It is also revealed that Magica was the one who sold Scrooge the painting in which the treasure map was hidden. She uses the treasures to bring Count Dracula Duck back from the dead. She sends Dracula Duck out to kill Scrooge and takes off. However, as Scrooge finishes off Dracula Duck, Magica is arguing with Flintheart, who only wants to give her the dime if she gives him the five treasures back so he can finally become richer than Scrooge, much to Magica's annoyance. The dime gets blasted to the top of Mt. Vesuvius, which is about to erupt. She transforms into a vulture, with Flintheart clinging onto her in order to get the treasures he wants. However, Scrooge reclaims his dime and escapes with his nephews, forcing Magica and Flintheart to flee in defeat, much to their anger. Although Flintheart is sent to prison, Magica's fate remains unknown.

Portrayals
In the 1987 series and the remastered video game, Magica was voiced by the late June Foray, who also voiced other villains:

In the reboot, Magica is voiced by Catherine Tate. When possessing Lena, Magica's voice is initially blended with Kimiko Glenn, then fully becomes Glenn's once Magica settles into Lena's body.
 * Ma Beagle - DuckTales (original)
 * Natasha Fatale - The Rocky and Bullwinkle Show
 * Witch Hazel - Looney Tunes
 * Lucifer - Disney’s Cinderella
 * Wheezy - Who Framed Roger Rabbit?
 * Sour Kangaroo - Horton Hears a Who
 * Witch Hazel - 1952 Donald Duck short film: Trick or Treat

Trivia

 * She is the most powerful villain in the DuckTales universe due to her ability to use asteroids and lightning on Scrooge's Money Bin.
 * She apparently has some kind of history with Scrooge as she constantly mentions her goal to get "grim revenge" on him. However, their connections have yet been revealed.
 * In the DuckTales reboot, Magica speaks with a British accent. When she possesses Lena, she speaks with a mixture of both of their voices before settling for Lena's American accent.