I'll help you with your deck construction and don't worry it won't cost you an arm or a leg like most deck builds.
Firstly you're going for the ally
rally trigger with this deck so you're gonna want to play many allies as often as possible. That's why you should add the
retreat to emeria. This way every time you play a land you get a new ally and
kalastria healer's effect activates. Then if you add
vampiric rites to the deck you can sacrifice the kor tokens for health, draw a card, and zulaport cuthroat's effect also activates.
Next is the mana base. I'm not sure why people like caves of kolis so much but
scoured barrens is a better choice because you get the same dual land and +1 health. Just add more basic lands and you'll get the speed you need. Also try running less copies of high drops and you won't be hand clogged when it comes to mana.
Also in this deck I'm not sure if you want to attack as often as possible or not but if you add some nirkana assassins then it will deter blocking form the enemy when you gain life (especially if you're playing
tandem tactics when they least expect it). Really making this deck more focused on the vampires of Zendikar and less on other creatures from other blocks will make this deck more cohesive. Humans and kor are welcome if they add to the strength of the deck.