Burning Dreadsteed

When Burning Dreadsteed enters the battlefield, each opponent sacrifices 3 cards, discards 3 cards, or loses 5 life.
Burning Dreadsteed's power is equal to the number of mountains you control, its toughness is equal to the number of swamps you control.
If Burning Dreadsteed is destroyed by an opponent, that player loses 5 life, sacrifices target permanent, and discards target card. You gain 5 life when this happens.