Marvel's Out-of-control Player

When Thor was still showing off that no one could pick up his hammer, he quietly placed a Sword in the Stone next to it.

During the Battle of New York, while others were still struggling to clear out various miscellaneous soldiers, he had already started his unparalleled driving of the Gundam.

When a time traveler who thinks he is a player appears in the Marvel Universe and has the panel and abilities of a player, what impact will he have on the world as he improves step by step?