Grim Haruspex is the key of the combo, allowing you to draw a card every time a non-token creature dies. Your creatures-to-die are Endless One and Hangarback Walker. Shadows of the Past should make it easier to hit more Zeros to continue the combo. Sifter of Skulls gives you more mana to work with while combo'ing off (and it helps scrying as well). Taigam's Scheming and Treasure Cruise let you dig for combo pieces.

After dumping a lot of Zeros, continue your combo with Gravepurge, not only returning all of your Zeros, but letting you draw one of them too. After you're out of Gravepurge you can drop Learn from the Past to put all of your Zeros and Gravepurges back into your deck so you never run out of steam.

Your win condition is decking your opponent with Altar of the Brood and Sphinx's Tutelage, or at least killing them with Zulaport Cutthroat.