First and foremost, there's everyone's favorite Rabbit buildaround, Hare Apparent
You can play Brawl or Standard Brawl or on MTG Arena right now, a fun and charismatic format thats very similar to Commander, with a few key differences
Cards that Synergize with Captain America, First Avenger: Ajani, Strength of the Pride Ajanis ability to generate +1/+1 counters synergizes with Captain Americas growth strategy for creatures
At least for a casual power level, the important questions I think we should ask are which themes play well together, which themes are well supported and which themes fit best into a viable Commander gameplan. For the first answer, it feels like there are two sets of synergistic themes that happen to align neatly with the two blocks of rules text
4 Robin Hood, Champion Of Sherwood Stealing From The Rich And Giving To The Needy Coming out as early as three ink, Robin Hood, Champion of Sherwood is capable of challenging while still gaining lore