Here is what I would consider to be a mid-priced upgrade to the deck. The total cost rises to $68 in paper and $24 on Magic Online, but we get some hugely powerful additions, with Knight of the Ebon Legion improving our one-drop slot, Castle Locthwain offering card draw in our mana base, Ayara, First of Locthwain and Underworld Connections upping our devotion while also offering card advantage, and a full playset of Murderous Rider, which is perfect for the deck as a removal spell that eventually adds two black mana symbols to the battlefield.