Almost inevitably this means relying on permanents with disruptive static abilities that tax or outright prevent certain game actions
Peregrination is a classic budget card that both me and Mark's deck use in our decks since it's a four-mana Cultivate or Kodama's Reach with a scry attached
Inga and Esika, Morophon, the Boundless, Tesak, Judiths Hellhound, Magnus the Red, and Rakdos, Lord of Riots can all make a massive impact on how fast your army grows
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The first secondary commander is Rayami, First of the Fallen, who plays into the creature-exiling profit whenever the exiled creature has basically any static ability by bestowing said creatures ability onto the keyword-thirsty vampire
If you prefer to run Belakor, the Dark Master as the commander, youll probably look to add a few more demons and some support for that tribe