Choose one —
• Counter target spell unless its controller pays 3.
• Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.
Quote from master_of_the_universe »I'd seriously consider playing this in Modern. Sure, it's one mana more than both Mana Leak and Impulse, but you get to choose, and that versatility might be worth it.