Vespera, Timebinder Archmage

When Vespera, Timebinder Archmage enters the battlefield, you may tap target creature.
If you do, scry 2. (Look at the top two cards of your library. You may put any number of them on the
bottom of your library.)
{2}{u}{u}: Choose one —
• Tap target permanent.
• Untap target permanent.