Grixis Control

i have been playing this to some top 8s at some local events. the current plan is to keep the field clear until you slam down nicol bolas or draw it out with blood-hall. game one, i can usually out play my opponents by killing off threats until they are in topdeck mode. control match ups are harder but keyrunes and bloodhall keep other walkers in check and their kill spells are just dead cards. games 2 and 3 are mostly a plan to either side out some removal for dreadbores and or negates for controls and taking out return for temblor for more early game removal vs aggro. so far my losses are mostly to sitting on 2 landers and failing to find a third. any suggestions please let me know. i want to see if i can take my brew to the top.