AoE2. I played the hell out of singleplayer back in the day, and with Remastered they both added new ones and improved the storytelling in old ones. Art of War campaign also is a good introduction to multiplayer combat.
If you like historic stuff; you'll like it. There also exists lot of community campaigns
Deadlock and Marvel Rivals' gameplay are too different to be compared imo. Deadlock is a more MOBA styled fighter; where secondary objectives like killing minions / denying points contribute quite a lot to your effective performance. Marvel Rivals is more of a team shooter, where everyone has a slightly different role in the team per design.