This seems a little underwhelming because it is, but sacrificing things as part of a cost really isn't that difficult to get going in Grixis
They also have a big old chunk of text that reads, Whenever another creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature card leaves your graveyard, Syr Konrad, the Grim deals 1 damage to each opponent. That means that your milling is killing, and you can just be chilling
, , Tap an untapped creature you control: Create a Food token
The biggest weakness of the deck is its reliance on blink
Emeria, the Sky Ruin Emeria, the Sky Ruin is a nonbasic land that can tap for white and reanimates a creature card in your graveyard if you have seven or more plains in play