Your search for "Plains 306" revealed the following:
Plains (306) (40K) from Warhammer 40,000 Commander, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Zhillustrator
Plains (306) (Surge Foil) (40K) from Warhammer 40,000 Commander, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Zhillustrator
Plains (301) (CMD) from Commander 2011, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Michael Komarck
Farseek - C17 Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Martina Pilcerova Card Text:Search your library for a Plains, Island, Swamp, or Mountain card and put it onto the battlefield tapped. Then...
Plains (001) - Magic Premiere Shop Promo 2006 (Foil) from Magic Premiere Shop 2006, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Daren Bader Card Text:This Magic Premiere Shop (MPS) land was only printed in Japanese