Aside from Vision, the biggest unknown amongst the Avengers is the Scarlet Witch. While she might be relatively new to this whole superhero thing, her inexperience shouldn’t be mistaken for irrelevance. On the contrary, she might just be the most powerful member of the team.
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In Captain America: Civil War, we see her just starting to get comfortable with the more surface abilities of her power set. Controlling inanimate objects is child’s play, and she is now starting to ascertain how to control and contain impacts, as we see in the early part of the film. One of Wanda’s more skillful tricks is a version of mind control and suggestion, something she employs against Vision. Her Hex magic is already powerful, and she is still relatively young.
Just using the film as a foundation, we see her contain an explosion, lift and throw Black Widow, Spider-Man, and Captain America, and hold up a falling tower, not to mention when she takes possession of Visions Mind stone, contorts him, and pushes him several layers below the Avengers HQ.
In the comics, her abilities have grown to know almost no limits. As her powers mature, she is able to actually affect the fabric of reality, resulting in sometimes severe consequences. Examples of this can be found in House of M, where a few simple words result in millions of mutants becoming depowered. The same can be said of Avengers Disassembled, where reality meddling resulted in dead members coming back to life, only to destroy the team and ultimately kill Avengers member Hawkeye.
Still, when she isn’t struggling mentally, there are few more powerful and beneficial to have as an ally than the Scarlet Witch.