They have a lot of value particularly in decks with multiple colors
Colorless Commons So far, the colorless pool is slim, but Eerie Gravestone and Spider-Bot look like staples in draft
Your opponent is more likely to count your artifacts in play to see how much damage you can do if you already have Ravager or Plating in play, so by holding it when its not too useful on the board (say, if there are some blockers on the ground), you get to surprise your opponent with it when they use their mana on something else
Austere Command is split up into four selective board wipe effects, allowing the caster to pull off one-sided wipes against a variety of decks
All Hallow's Eve Another big time throw back, to the OG days of 1994 Magic: The Gathering
Evasive, regarding character cards, means that they can only be challenged by other characters who have Evasive as well