Foresight

Rune {3}{u}{u} (If you cast this spell for its Rune cost, it becomes an Aura enchantment with Enchant Creature.)
Look at the top three cards of your library. Put two of them into your hand and the rest on the bottom of your library, then discard a card.
Whenever enchanted creature deals combat damage to a player, Scry 1. You may discard a card. If you do, Investigate.