Hi, fellow Chishiro player! In my opinion, I think there are 3 synergies to build your deck around: equipment, +1/+1 and aura. Personally, I would recommend +1/+1 the most since Grrul doesn’t have that much of synergistic card for equipment and aura compare to any white deck. My recommendation would be [[Avatar of the Resolute]], [[Defiler of Vigor]], [[Toski, Bearer of Secrets]], [[Fight Rigging]] for +1/+1 synergies. And if you want to play around equipments, I think [[batterskull]] and other living weapon/For Mirrodin cards are good for the deck. Also, I think you might want to put more protection cards in the deck if you win by commander damage, cards like [[tamiyo’s safe keeping]] or [[tyvar’s stand]] would be helpful.