The layout of this page would be six panels. The top of the page would have three vertical panels, below that would be two square panels, and the final panel would be a horizontal panel across the bottom of the page. It would need to be drawn in almost a classic 70s style to get the feel I'm going for.
We see Mephisto, in all of his glory, sitting upon a throne surrounded by scantily-clad women, some of which are feeding him grapes and fanning him. All around debauchery basically.
Text Box: I can give you all that you desire...
Mephisto standing on a cliff overlooking a vast and prosperous nation. His arms are outstretched to the city immediately below, and two of the girls from the previous panel are there with him, although much more properly dressed this time in robes and such.
Text Box: All this and more can be yours...
The women are draping strings of precious gems upon Mephisto, and one is placing a crown inset with gems upon his head.
Text Box: Wealth, power, women...all of your pathetic heart's desires...
Close-up on Mephisto's face.
Mephisto: "...if only you submit yourself and everything you believe in...to me."
Mephisto: Useless, human desires! Mephisto has no use for such things! I desire only souls!
We see Mephisto from behind, but something is different. He is standing in what looks to be a meeting room. He is not the haughty, proud Mephisto we know. He stands slumped, and his head is hung in what appears to be shame.
Mephisto: This is why I...begrudgingly come to you. You're known for making the impossible happen.
We see the (classic) Avengers standing on the other side of the room. They all have shocked expressions on their faces, the most shocked of them belonging to Steve Rogers. Mephisto has taken a knee in front of Captain America and almost has a pleading look on his face.
Mephisto: Make them stop! They won't leave me be! I need your help, Avengers!