Scavenge exiles a card from your graveyard to put +1/+1 counters on a creature like a twisted version of undying
It doesn't stop there though - even though I'm sure many would prefer it did - as we have the release of the Avatar: The Last Airbender crossover set coming this November
When I first built Feldon, it had a Goblin and artifact sub-theme since there are a lot of Goblins that have special abilities, including those that relate to artifacts, and the copy that Feldon makes is an artifact (cards such as Goblin Welder and Goblin Trashmaster, for example)
The Blue and Green Praetors, Jin-Gitaxias and Vorinclex would also have been exciting to see, and would have made a significant in both that individual game of Pack Wars as well as my collection of potential cards for Commander
A consistent game plan, a solid land base, and creatures and threats that your opponents need to deal with