Count the number of cards in your graveyard as Countervailing Winds resolves to determine how much mana the controller of the target spell must pay to avoid the spell being countered. Countervailing Winds is still on the stack at this time and won’t count toward this number.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.