Sorcerer pits vampire against Lovecraftian horror, demonic hellspawn against mythological monster and MTG-like card battles against gameplay that veers between fighting for control of areas of the city, deckbuilding and rolling dice
If you do consider making a purchase, Id recommend offering 20% lower than their listed price in order to try and grind the profit
Backup was just a particularly lovable mechanic in Limited, and I'm hopeful we have some cards that will play roles elsewhere
Perhaps the best example is Aang himself, who has a mono-White card in Aang the Last Airbender, a tricolor version in Aang at the Crossroads, and a four-color version that turns into a WUBRG creature in Avatar Aang/Aang, Master of Elements
Most of those are pretty bad, but I love a commander that incentivizes playing with cards that don't have a home anywhere else