For the August 2010 MOPR season (July 28 to August 25) the Tier 1 and 2 alternate art land promo cards are from the third set of the European Land Program, originally released in September 2000 for the Invasion booster box sales promotion.
Each card represents a European location: the plains depicts Steppe Tundra, Russia; the island depicts White Cliffs of Dover, UK; the swamp depicts Camargue, France; the mountain depicts Mont Blanc, France; the forest depicts Nottingham Forest, UK.
The Tier 3 and 4 promo card is Lightning Hounds, originally released as an insert for TopDeck #2.
The Tier 5 and 6 promo card is an alternate art Curse of Wizardry, originally released as part of the Wizards Play Network in 2010.
The Tier 7 and 8 promo card is a textless Hinder, originally released in 2006 as part of the Magic Player Rewards program.
The Tier 9, 10, and 11 promo card is a full art Mitotic Slime, originally released as the Top 8 prize card for the Magic 2011 Game Day.
The MOCS Season VIII Championship promo card is the full art Voidslime.
Enjoy and good luck!
