Silverblade Menance is a really big gift to mill archetype. It helps in both aggro and control matchups greatly, and it just helps in all matchups but those are two mill struggled with. For aggro the life drain and flier to block 4/2 dragons is game changing. For going against control, it gives you immediate face damage which is so needed for pushing towards victory, and it performs greatly when that face damage destroys a weapon.
This list was taken from another deck list and enhanced both pre and post Spire. I want to like/love
Felrauk the Outcast but it's an insanely bad card lol. It's both super inconsistent and underwhelming. It probably won me 1 game while losing me 10. I left 1 in just to maybe help against the mirror match but even then it's not that great there, I would take it out or not craft it at all. What's more important is that you discard cards and play to tempo.