2 levels. The scale is:

Unknown- 0
Unique- 1
Impossable- 2-3
Exceedingly Rare- 4-7
Extremly Rare- 8-15
Very Rare- 16-30
Rare- 31-75
Very Scarce- 76-150
Scarce- 151-350
Fairly Common- 351-750
Common- 751-2000
Extremely Common- 2000+
Reciculously common - 5000+
Le Cove Chips - 16,000+ (Rare in Playable sets per Bob)