Whistling Swiftness

First strike
Madness {2}{r} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
You may discard a card instead of paying Whistling Swiftness madness cost.
Whenever you discard Whistling Swiftness, it deals 2 damage to target creature or player.