Chronicles Foreign Black Border

Giant Slug

{5}: At the beginning of your next upkeep, choose a basic land type. Giant Slug gains landwalk of the chosen type until the end of that turn. (It can't be blocked as long as defending player controls a land of that type.)

Chronicles

o5: During your next upkeep, choose a basic landwalk ability. Giant Slug gains that landwalk ability until end of turn.

Legends

o5: During controller's next upkeep Giant Slug gains landwalk ability of controller's choice until end of turn. The type of landwalk chosen must correspond with one of the five basic land types.