Dargo, the Shipwrecker Dargo, the Shipwrecker has silly synergy depending on which partner commander you choose
This probably makes it overly useful in Standard or Limited, but its Commander potential is huge, and I can see why it's been included in the Avengers Assemble precon
You can activate Sheoldred's last ability if any opponent has eight or more cards in their graveyard, not necessarily all of them
Spells and abilities that interact with activated abilities will interact with unearth, but spells and abilities that interact with spells will not
While it does require setup, the outcome here can be game-winning
Now tempo is far too great for four mana draw spells and so you can only play Deep Analysis if you are reliably able to get it in the bin