I've never done one of these so here we go
Top 10:
Howard the Duck
Mimic (Exiles)
Morph (Exiles)
Man Thing
Multiple Man
Winter Soldier
Mr. Sinister
Yellowjacket
Hover Chair Prof X
Bob
Spider-Man Variant:
Bag-Man
Wolverine Variant:
Weapon X Helmet Wolverine
Event- Cap's resignation (Nomad, Falcon, Golden Archer, Sharon Carter [or sub one for Richard Nixon])
Team- X-Factor 90s (Havok, Strong Guy, Wolfsbane, Forge)
Character- Deadpool through the Ages Boxset [note not all Deadpool] (Ultimate Deadpool, Agent X, Deadpool in Mask and boxers, T-Ray)
My Choice- Howard Set (Howard the Duck, Man-Thing, Dr. Bong, Iron Duck Armor)
Edit: I know this is the wrong section, but if DC haven't ended, I think a Batman through the Ages set would be awesome (Keaton, West, Animated, and Bale, or Kane, Adams, Sprang, and Ross)