Brother Blood

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, create X blood tokens, where X is half the life missing from your starting life total, rounded up.
{1} Sacrifice a blood token and gain 1 life.
{x}{t} Give up to X creatures you control lifelink
until end of turn and create X blood tokens.