Reanimation is also a good plan for mill decks, and cards like Virtue of Persistence or The Soul Stone should find their way into mill decks, if only to disrupt reanimation targets or use powerful milled pieces for your own gain
Most Magic cards have mana values somewhere between 1-6, so the chances of you having a blue card with the correct mana cost (or enough lands available to pay for it) arent all that low
Maybe you get to draw cards from a Harmonize, or maybe you sweep the battlefield with a Wrath of God, or maybe you get to spin the Wheel of Misfortune
Deflecting Palm is a cheaper version of these cards, which is great
Four out of five games I'll hit my fourth and stay on curve
If Lich-Knights' Conquest is countered, you won't sacrifice anything