Doctor Light

When no player is Earth, all Villains and their teammates win the game.
You may flip this card face up any time as long
as you have 20 or less life.
When this card is flipped face up, deal 2 damage
to all creatures your opponents control. They
cannot be regenerated.
{2}{t} Draw 2 cards, then discard a card.
{x}{t}Exile target attacking creature with CMC X.