The full texts of these abilities are "At the beginning of the monarch's end step, that player draws a card" and "Whenever a creature deals combat damage to the monarch, its controller becomes the monarch." (2020-11-10) If the triggered ability that causes the monarch to draw a card goes on the stack and a different player becomes the monarch before that ability resolves, the first player will still draw the card
This doesnt just give you a body count advantage
If you decide to play Shock Lock, you should believe that you will face only a couple of decks during the course of a tournament whose primary game plan counters yours
Hall of Heliod's Generosity can similarly be cut for an additional basic land, and any remaining high-value dual lands can be traded around for whatever budget dual lands you have on hand
The juxtaposition of Heaven and Hell, holy and fallen, are presented in that style of oversaturated religious fantasy you see in old paintings as well as that church you went to one time with the deeply traumatizing sculpture of Christ covered in way too much blood