The Curve Keeper [Unknown Event]

Cost: 4 W W Creatures you control get X/ 0, where X is the greatest number of consecutive nonland, nontoken permanents in a mana curve you control. (For example, if you have permanents with mana value 3, 4, and 5, creatures you control get 3/ 0. If you're missing 4, they only get 1/ 0.)