I'm really liking Araumi of the Dead Tide; dimir has always been the dominant colours for reanimator in my cube, but their gold cards are seriously lacking in that department. Both blue and black have plenty of creatures with ETB/dies triggers so she shouldn't be to difficult to get value from. She kinda reminds me a bit of Sedris, the Traitor King.
Honestly this whole cycle of uncommon gold legendries has been my favourite part of the set so far, I'm considering trying out at least half of them.
Prava of the Steel Legion2W
Legendary Creature - Cat Soldier
During your turn, creature tokens you control get +1/+4 3W: Create a 1/1 White soldier token.
Seems absolutely insane in any cube that supports white tokens; the anthem makes tokens practically unkillable and the activated ability seems comparable to that of Jade Mage (which is a card I really like playing with).