First, the deck features powerful graveyard mechanics such as The Scarab God's reanimate ability, Gisa and Geralf, Tomb Tyrant, and many others
The cards effectiveness does depend a bit on opposing cards played, but this card should be an efficient two-for-one a majority of the time
But if you want to play Stenn as commander, then use it alongside such cards like Metalworker to generate mana, Enlightened Tutor to find the needed artifact for the moment, and a whole bunch of impactful 1-mana and 2-mana artifacts
You actively want your creatures to die so you can keep these triggers going, so blocking with weak creatures turns into major burn damage
With multiple printings in Collector Boosters, there should still be plenty of money to be made as well
Trigger Coven The Coven mechanic can be pushed with Verdurous Gearhulk and Juniper Order Ranger, which allow the distribution of +1/+1 tokens