I believe I will be making these changes once I get the cards (or move them from other decks)

Sepulchral Primordial > Avacyn, Angel of Hope

Seer's Sundial > Mind's Eye or Underworld Connections or Phyrexian Arena Undecided on which will be better for this deck probably Phyrexian Arena

Rhystic Tutor > Demonic Tutor

Priest of the Blood Rite or Humble Defector > High Priest of Penance Unsure which one would be better to cut, or a different card: Vigilante Justice maybe??

Commander's Sphere > Sol Ring

Thinking about it: Humble Defector > High Priest of Penance

And probably Vigilante Justice > Reconnaissance

Swap Kessig Malcontents and Warstorm Surge for Solemn Simulacrum and more ramp/draw/tutor?

Seems like you are farther and more advanced in your deck than my human tribal, but here's my version of Mardu Human Tribal if you'd like to comapre, Mardu Human Tribal.

I'd like to think mine is more purely humans and is based around going wide and constantly throwing out attacks each turn.

Thanks! I have recently got in a few cards that I expect to make it further tuned. I built this deck to use ETB effects from the graveyard from Alesha, Who Smiles at Death ability.

It works good so far in my normal play group. I have a few more tweeks I want to do. It's almost were I want it to be.