They will make Plating nearly twice is painful, they will make Ravager twice as scary
When Omniscience is in play, you can play any card from your hand, completely disregarding its mana cost
starting with Fabled , you can now find Epic and Iconic cards in Disney Lorcana booster packs
You could build it up as a Voltron commander and make use of this to commander damage your way to victory, or fill it up with other ways to dish out damage like Roiling Vortex and Guttersnipe
It's also in the same colors as what's arguably the best deck in Pioneer, Rakdos Demons, so by buying Rakdos Aggro you get a good chunk of the mana base for a second deck
Bloodgift Demon is a backup Phyrexian Arena , but can also be applied to other players if you need to ping them for the last couple damage or want to make a deal to help someone draw a couple more cards