Only got to try the Alela deck so far
Gatekeeper of Malakir or Feast of Blood could swap for Geth's Verdict , Gifted Aetherborn or Nighthawk Scavenger could supplement Vampire Nighthawk , Pulse Tracker or Vampire of the Dire Moon could replace Mardu Shadowspear , Blood Artist could replace Cutthroat, Vito, Thorn of the Dusk Rose provides redundancy for Sanguine Bond , Pawn of Ulamog can provide sac fodder for cards like Ob Nix or Viscera Seer , Nullpriest of Oblivion is a flexible way to reanimate beefy monsters like Sangromancer , Vampire Nocturnus , Malakir Bloodwitch , Butcher of Malakir , or Kalitas, Bloodchief of Ghet
Anywhere Crucible sees play, this has a pretty good chance of seeing play instead for that reason
If youre spending tons of mana on something in Commander, its going to be strong
Especially at casual nightits not as though you are playing for prizes
These use F and exist to tell you what kind of half-deck you're working with before you shuffle two packets together and call it a deck