Universal Contagion

a. Play this card immediately when drawn.
b. Place a -x/-1 contagion token on Last Creature Placed onto Battlefield by each player.
i. X is a countdown counter (upkeep step) of creature’s power.
ii. Remove contagion counter when x = 0.
iii. Any creature that blocks or attacks alongside a contagion creature acquires a contagion token.
iv. Contagion counter follows creature to graveyard and exile.
c. Mix card back into library, draw a card.