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This one's a stretch. He'd have no idea how to deal with her.
RR is one of the main heroes in Marvel for inter-dimensional science and advanced physics.
Plus Agatha Harkness is more of a FF character than anything else.
Maybe Wanda messes with the dimensions and RR is around to help Sword understand what is going on and possibly fix it.
Darcy is funny and all but the character doesn't have the brains to follow this through to its conclusion. Not how she has been written up to this point, so far Selvig was that guy.
RR's main power is his mind, so he would be able to spot possible attack vectors.
RR was key to fending off Galactus many times and was also key to saving his life. If he can deal with the big G he could part-way at least manage Wanda.
Plus Agatha Harkness is more of a FF character than anything else.
Maybe Wanda messes with the dimensions and RR is around to help Sword understand what is going on and possibly fix it.
Darcy is funny and all but the character doesn't have the brains to follow this through to its conclusion. Not how she has been written up to this point, so far Selvig was that guy.
RR's main power is his mind, so he would be able to spot possible attack vectors.
RR was key to fending off Galactus many times and was also key to saving his life. If he can deal with the big G he could part-way at least manage Wanda.