So I thought of this build. It's called the Dragon Pulse.

Inspired by the Miracle Pulse Developer Map a few months ago, I thought I could make something similar. It requires a similar setup. At least two Infantry Pulse (or if you can afford three, then go ahead) and a Quickened Pulse seal is needed. Then bring a dagger unit, as in my opinion, they are the best among ranged as they have a Killer and a Wo Dao dagger. This should preferably someone with a high Attack stat, notably Sothe or Kagero, whoever you have. So here's the build:

+Atk -anything but speed

Kagami Mochi/Lethal Carrot (+Spd or +Atk)
Assist skill
Draconic Aura with Lethal Carrot or Dragon Fang with Kagami Mochi

Life and Death/Death Blow
Windsweep/Chill Def
Flexible C slot
Seal: Quickened Pulse/Attack+3/Phantom Spd3

If you have only 2 Infantry Pulse, then give Quickened Pulse. But if you could afford 3, then feel free to use Atk+3 or Phantom Speed, depending on what B slot you get.

Let's take for example Sothe as he has the highest attack among daggers. With +atk, he has 39, with either weapon, he reaches 51. With Life&Death he will reach 56; with Death Blow, he will do 57 when initiating without merges. On turn 1, his special will do a full charge due to QP and IP's. With a Kagami Mochi and Dragon Fang, he will deal 56+(56/2) = 84 damage on the first initiation considering his native Life and Death. With the Lethal Carrot and Draconic Aura, he will deal 56+(56*0.3)+10 = 83 damage on initiation. The difference is very small, and if he has Chill Def, the number of units he can OHKO on the first attack will drastically increase. The weapon chosen is up to your reference

Based on the simulator, the Kagami Mochi build has better results. It will only lose against Fjorm if she keeps her base kit.

Thoughts?