Starting from its very first Pro Tour, Dark Confidant has basically never been anything but a staple in every single format its legal in
You need to make sure that you plan out when your cards are being cast and also not flood your deck with massive cards that rely on your Commander, because you may not always have Jhoira either
Each booster contains at least one Rare or Mythic (maybe more!), a guaranteed foil, and an art card
There are over 100 Hero cards in Sapphire and Steel , so there are countless ways to build this deck
Therefore, green ramp cards are the gold standard against which other colors ramp effects are judged
If you have a commander that cares about assassins hitting your opponents, that deck is probably an assassin typal deck focused on getting in with assassins