Since Duskana cares about base P/T, you can run cards like Beastmaster Ascension and Sovereign Okinec Ahau to buff the team without messing up your commander
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The deck then adds powerful abilities that take advantage of your graveyard including Exdeath (transform), Cloud of Darkness (removal), Fang (card draw), Ardyn (reanimate), Diamond Weapon (acceleration from graveyard), The Final Days (2/2 Horror Tokens), and Evil Reawakened (reanimate)
1 Puppeteer Clique
Also, turn 1 land, Artificers Assistant into turn 2 mana rock (of which I know you likely run many) or T2 commander gives you an immediate advantage to manipulate your draw for turn 3
Currently for Commanders, The First Sliver and Sliver Overlord give you card advantage, the latter and Sliver Queen are combo outlets, and Sliver Hivelord and Sliver Legion are there to increase staying power and damage