MCU Thanos and every named character (who actually has feats) who's worked for him will be going up against every character who could be called an Avenger (either so far or in the upcoming Avengers 4) in the MCU.
TEAM THANOS
Thanos
Ebony Maw
Cull Obsidian
Corvus Glaive
Proxima Midnight
Gamora
Nebula
Loki
Ronan
Korath
Vs
TEAM AVENGER
Iron Man
Thor
Captain America
The Hulk
Black Widow
Hawkeye
Quicksilver
Scarlet Witch
Vision
War Machine
Falcon
Bucky Barnes
Ant-Man
The Wasp
Doctor Strange
Spider-Man
Black Panther
1) Bloodlusted in Khazan.
2) In-character in Wakanda.
3) Both sides have a week of prep.
Thanos has no Infinity Stones.
How goes it? What happens if Thanos has the Power Stone?