If your goal is to attack often you can look for commanders like Isshin, Two Heavens as One and attack triggering cards like Inti, Seneschal of the Sun, Hellrider, and Beastmaster Ascension
Skeletal Scrying The next three all produce pretty much the same effect as each other, but in slightly different ways
While Drain Life only lets you target a single player, you can switch it out for cards like Exsanguinate or Debt to the Deathless, which can make all of your opponents lose life
If you're playing Aristocrats, Mill, or Reanimation, or can produce infinite black mana in some way, he's likely going to be one of your win conditions
Elemental Blasts + Hydro/Pyroblast Blue Elemental Blast, Hydroblast, and Null Elemental Blast are a few of the best color-hoser cards in the game