Diffusion Sliver [Magic 2015]

Set: Magic 2015 Type: Creature — Sliver Rarity: Uncommon Cost: {1}{U} Whenever a Sliver creature you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays {2}. "The hive shimmered, and its walls seemed a living mirror." —Hastric, Thunian scout