Chandra, Supernova

+2: Chandra, Supernova deals 3 damage to target creature or player. You may discard a red card if you do Chandra, Supernova deals 6 instead.
-4: Each player discards their hand. Chandra, Supernova deals 2 to each opponent for each card discarded this way. Then draws 5 cards.
-10: You get an emblem with "Whenever you cast a Red spell this emblem deals 6 damage to target creature or player.