Hey, you really should run
Expedition Map to get the tron combo.
Also creatures like
Matter Reshaper,
Reality Smasher and
Thought-Knot Seer very strong if you can cast them as soon as possible.
Scour from Existence is very expensive for a removal.. Maybe you could run
Dismember.
And do not
forget to get 2-3 copies of
Wastes. Some spells like
Path to Exile will give you the chance to search your libary for a basic land.
And i do not think
Vexing Scuttler is worth to play in your deck..
Maybe this is usefull. Eldrazi is a lot of fun to play!