Cacophodon provides a nice crossover with the red pingers and both play well with mini-wildfire style effects that benefit from big mana, with X-spells that distribute damage (Rolling Thunder) becoming possibly very powerful with the other enrage creatures
Skilled Combatant rewards beating up your opponent's characters because, in banishing them, you gain two lore
Thats not to say a group hug card must benefit everyone to qualify, just that group slug commanders and cards are a more distinct category
Even Jim Hawkins of Treasure Planet is getting in on some action for the first time since 2002
Talrand, Sky Summoner A solid baseline for any Commander is rewarding you for doing things that are already part of your strategy
Time counters were plentiful in the MTG Doctor Who set, and we've seen some new cards sporting the same keyword in the upcoming Lost Caverns of Ixalan