This is a deck designed to be as strong as possible without any rares or legendaries. The only goal is to push damage to face, as much and as fast as possible. Nothing costs more than 2 power, so you can (and should) keep just about any 2-power hand. (Technically the Conscript costs 3, but you can Shift it for 1. When it pops out, it's a free 3 damage to face via unblockable.) You could choose to include Shugo Standard and/or Rune of Flame in place of some sigils, but it's dangerous to put in too much depleted power.
Ornate Katana and Impatient Pyromage both give some card draw. Mindfire can allow you to bypass blockers. Flame Blast can potentially give you the last bit of damage for lethal. Nimble Conscript is a turn 1 play if you don't have a 1-drop. Both Warhelm and Battlefront Dasher can provide charge. Oni Ronin, Warhelm, and Rakano Outlaw all provide Warcry, which can be especially excellent if you buff up a Passionate Stonehammer. Scythe Slash is meant to be used with Stonehammer on his berserk turn (and Katana also works really well on Stonehammer).
You don't really need more than 3 power at any point, so any extra power can be plundered into card draw via Passionate Stonehammer and Scythe Slash. But don't use their plunder to turn any actual cards into sigils.