The accessibility for newer players to learn and join the competitive side of Magic the Gathering hasnt been as easy and affordable than now
Turning your spells into face-down creatures that allow you to cast copies of them when they deal combat damage is a pretty wild design space, but it feels very at home in Rakdos colors
Theres also a lifegain theme
MTG: The Lost Caverns of Ixalan We return to a world that seemingly time forgot
Cruel Ultimatum and Nicol Bolas, Planeswalker and Maelstrom Wanderer are the closest to those (I dissent from the Wadds argument that 3-color fatties are more restrictive than 3-color, uh, non-fatties), but then some build-arounds like Zur the Enchanter, however powerful and fun, don't work, and I think about just having Nacatl and Ultimatum and feel much better about my design choices
Medallions Rocks that ramp for two mana are big game