2020-08-07 : Death's Shadow's ability applies only while Death's Shadow is on the battlefield. In all other zones, its power and toughness are 13.

2020-08-07 : If your life total is negative, X is considered to be 0.

2020-08-07 : In a Two-Headed Giant game, your life total is your team's life total.

2020-08-07 : The value of X changes as you gain and lose life. It's not locked in as Death's Shadow enters the battlefield.