Treachery

Oracle Text

Enchant creature

When Treachery enters the battlefield, untap up to five lands.

You control enchanted creature.

Card Rulings

10/4/2004 You can untap 0 to 5 lands.
6/8/2016 You choose which lands to untap as the triggered ability resolves. They aren’t targeted, and they don’t have to be lands that you control.