Dragon of the Death Cloud

Flying, deathtouch
Whenever Dragon of the Death Cloud deals combat damage to a player, each player loses 1 life, discards a card, sacrifices a creature, then sacrifices a land.
Dash - {3}{b}, Sacrifice a land. (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)