Both have abilities that ping your opponent for incidental damage, which ties into a lot of different synergies in the deck
While most of them have decent value on their own, some of them have synergies that are important to pay attention to
Guardian Project will draw a card every time a creature enters the battlefield, with some conditions
Think of the scariest, most horrifying creature or planeswalker you cast in blue or any colors that partner can access
When you reanimate Archon of Cruelty, your opponent must sacrifice a creature or planeswalker, discard a card, and lose three life, you then get to draw a card and gain three life
For example, Danitha Capashen makes it easier to cast Equipment and Auras, and her trio of keyword abilities makes her a great place to put them