Back in the day, Juzam Djinn was a powerhouse, for four mana you got a 5/5 at the cost of one life per turn, outclassing most other creatures at the time
This video was framed as a "variety show" featuring many Magic celebs both in R&D and on the professional player circuit, as well as a fair amount of bloggers from international Magic communities
This enchantment has many applications, but what you should be excited about are these: Commanders like Kykar, that generate creature tokens from the Command Zone
The specific four color Jace card that will be leading the deck has not currently been previewed
And since it's unlikely that Wizards will ever produce a set exploring this area of design space (although it would be pretty fucking awesome if they did), I decided that I had to do it myself
The former are typically made when players dont own a card thats not feasible to get, like Black Lotus or any Power 9 card for that matter or for more authentic playtesting