Needless to say, theyre usually the most expensive cards
While Underworld Breach has the downside of giving your cards Escape 3 (and causing you to blow up your graveyard in the meantime), it also has the incredibly relevant effect of not exiling the card that youre casting
You look at a foe's hand, and you can cast them this turn with mana of any amount counting for that
Would I be more interested in repeatable draw, like Jor Kadeen, First Goldwarden, in the CZ
This works especially well with your commanders second ability, since the creature copies are artifact creature tokens
Passively gaining two life each upkeep from turn 1 onwards doesnt sound like much, but the free lifegain trigger means your Ajani's Pridemate grows every turn and life outlets like Greed and the incredibly strong Toxic Deluge always have resources available