You get to play all the powerful white creatures Jace was previously excluding like Blade Splicer, while Sword of Feast and Famine is still good with blue cards when you pay the full sorcery price for it
Vintage Cube is more or less the fast mana format, and its easy to understand how one player having access to six mana to the other players four can lead to all kinds of snowballing advantages
Shivan Devastator Shivan Devastator is almost like a Blaze with wings
Not only does this mean that your Humans can deal damage to a defensive player by simply attacking another opponent, but if the chosen player is attacked, they effectively sustain twice as much damage
Valki, God of Lies / Tibalt, Cosmic Impostor Just to be fair, Im only gonna talk about the Tibalt, Cosmic Impostor side of this card, since the other side isnt technically Rakdos but mono-black