I am doing the Everything Seed in Hardcore mode with my brother on Console in Split-Screen Co-Op. This challenge is extremely tough, however I have done extensive research on this seed so I know what to expect!
The "Everything Seed" combines every secret seed in the game and keeps most of the features of every other seed, as well as adding some new unique features. This is the Magnus Opus seed, as the developers refer to it as, and has lots of content to explore, including content that is yet to be discovered!
Currently, Defensive Gaming! has 1,077 views for Terraria across 34 videos. There's close to 5 hours worth of content for Terraria published on his channel, or 44.87% of the total watchable video on Defensive Gaming!'s YouTube channel.