Mind's Dilation (MSC) #277 [EN/N]

{5}{U}{U} · Enchantment · Whenever an opponent casts their first spell each turn, that player exiles the top card of their library. If it's a nonland card, you may cast it without paying its mana cost. · "Our moment of crisis is now at hand!" —Uatu, the Watcher · Illustrated by Rafater · Marvel Super Heroes Commander #277 · EDHREC rank 2682 · Magic: The Gathering, MTG