First and foremost, there's everyone's favorite Rabbit buildaround, Hare Apparent
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
Containment Priest
Unholy Grotto is a Land that let us pay , to put target Zombie card from our graveyard on top of our library
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
Greater Auramancy Anime Art Card (Gold-Stamped Signature) 2 Printings and their Prices Track Greater Auramancy Anime Art Card (Gold-Stamped Signature) Prices Free collection tools for Magic: the Gathering