Giant Slug

{1}{B} · Creature — Slug

{5}: At the beginning of your next upkeep, choose a basic land type. This creature 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.)

Motor: se resuelve a mano

Rulings (2)

If the Slug changes controllers after the mana is spent, the player who activates this ability selects a landwalk during their next upkeep even if they don't control it at the time.
Wizards of the Coast · 2004-10-04
When the ability resolves, it creates another ability that triggers at the beginning of your next upkeep. When that ability resolves, you choose a basic land type.
Wizards of the Coast · 2004-10-04