Just firing this off into the dark, had the idea a while back, worked it around. This is for post-rotation.

[u]Creatures:[/u]
Typhoid Rats x4
Brain Maggot x3
Nyx-Fleece Ram x4
Underworld Coinsmith x3
Master of the Feast x3
Grim Guardian x3
Fate Unraveler x3

[u]Spells:[/u]
Ulcerate x3
Devouring Light x3
Stab Wound x3
Banishing Light x3

[u]Planeswalkers:[/u]
Ajani Steadfast x3

[u]Lands:[/u]
Swamp x10
Plains x8
Caves of Koilos x4

Any suggestions/input would be greatly appreciated. Thanks!

you really can't plan for post rotation... khans will bring a whole new slew of cards in to standard. Best bet is to collect things that are 'always good" and try to see what's available in those colors in october.

Things like... (but not limited too)

Thoughtseize
Heroe's downfall
Nissa
Courser of Kruphix
Polukranos
Stormbreath dragon
Elspeth
Pain lands
Chord of callings
genesis hydra
Bigger Blacker Garruk (cuz you know once you go black)
Scry lands
Anger of the gods
Gods

just get your hands on as much of these as you can...