Triskaidekaphobia

At the beginning of your upkeep, choose one:
Each player with 13 life loses the game, then each player gains 1 life; or each player with 13 life loses the game, then each player loses 1 life.
If a player loses the game this way, transform Triskaidekaphobia.
Triskaidekaphobia - the fear of the number 13 or things relating to the number 13.