By peering into the future, you pick through the possibilities to anticipate your enemy's next action.

Encounter  
Standard Action      Ranged 5

Target: One creature

Effect: You gain a +2 bonus to the attack roll of the next at-will melee attack you make against the target before the end of your next turn. If that attack hits, it is automatically a critical hit.

Published in Player's Handbook 3, page(s) 18.