Good Synergy here but your land count seems really low, especially with six 5-drops. I'd up it to 22 land minimum probably adding two white sources. Any cuts should be made at the higher end of your mana curve. Your one drop slot is already pretty well stocked for aggro but you may want to try one or two more copies of
Legion's Landing as it gets a lot of value trough the rest of the game and is still a decent top deck if you don't see it until a few turns in. Even if it is legendary, you'll value the consistency of using it almost every match.
I can see you're making a budget build so I won't begrudge you the
Walk the Plank s in the Sideboard
However, I would suggest some way to deal with artifacts, enchantments, and planeswalkers after they resolve. Maybe
Cast Out,
Fragmentize,
Ixalan's Binding, or something of that nature.
Otherwise it looks like a fun build! I like using the
Authority of the Consuls to make sure you get all those juicy attack triggers without losing your vamps to blockers. Not to mention the synergy with
Seal Away! good stuff