Considering with Jorn untaps that mana when he attacks, not when he deals damage, you'll always have the mana needed to pull these off quite nicely
Commander Overview You actually get two Commanders with this deck, thanks to the partner mechanic, although this is a slightly more restrictive version, as cards may only partner with cards named in the rules text
When this creature dies, create X 1/1 white Vampire creature tokens with lifelink, where X is its power
But not literally, just figuratively
It's the de facto best commander for its respective creature types in Commander, and that's before you even factor in the back half
Play Standard, Block or Arena Modern (when introduced) as you like