With them, you can get an idea of how much your cards are worth
This kind of deck will enjoy cards like Sun TitanSun Titan, Ashnod's AltarAshnod's Altar, and Bomat CourierBomat Courier - essentially anything that will allow you to accrue value over time while also being aggressive
Pairing this with the Captain America, Team Leader ability could lead to a seriously stacked board sooner rather than later, so expect to be an easy target for other players at the table.
Treefolk Umbra - if these are cards you play already, Stoneskin should fit your deck nicely
Theyre both card types that have an effect then go to the graveyard after resolution
I think this is a card much more suited to the sideboard, but the two copies players are trying to fit into their Jund control builds doesnt seem crazy