S2 with speedy Yufine and that increased silence would be great but I don't think I'm down with redoing all her gear.
Mannn... I didn't think much of Yufine besides using her in B11 but man she a beast in PVP. Think I'm love.
You got an aurius tank? Yufine don't care. Got aurius and FCece shield? Yufine don't care.
Got an Aurius, shield and Mark of valor on your blue unit? Yufine don't care!
I'm going for the S1 30% atk buff myself.