This means that when they deal combat damage to a player if they aren't renowned, you put a +1/+1 counter on them, and they become renowned
Once transformed into Green Goblin it trades conniving away for mayhem which feeds on any other looting abilities you have
A lot of the best Energy generators are at Common, including Attune with Aether and the new Tune the Narrative
So if you can keep your commander in play you get benefits from your backgrounds, plus the powerful effects from cards like Skyhunter Strike Force for a massive melee, Tyrant's Familiar to burn off creatures, and Thunderfoot Baloth to finish opponents with a permanent, only slightly smaller Overrun
What about Deckbuilder Toolkits
However, these require Energy cards