Celes, Rune KnightCeles, Rune Knight has both an incredibly powerful enters ability, letting you filter and add to your hand, and a passive ability that lets you trivially win the game with a persist creature, such as Murderous RedcapMurderous Redcap, and a sac outlet, such as Viscera SeerViscera Seer or Goblin BombardmentGoblin Bombardment
You need your hate to be well layered to beat Living End, but you need enough normal stuff to stop Temur Crashcades doofy backup plans
Whenever Sin enters or attacks, you must " exile a permanent out of your graveyard at random, then create a tapped token copy of that card
The success of that set remains to be seen: Wargamer's Matt Bassil called it "a set made for no-one", but some cards are seeing price spikes thanks to demand from MTG Commander players
The Filigree Sylex handles early-game pressure well, can get you out of trouble in a pinch later, and acts as a win condition if unneeded