Zombie Apocalypse(Wave 2)

Hexproof. When Zombie Apocalypse(Wave 2) enters the battlefield, amass 2.
{5}{t}{ut}{t}{ut}{t}{ut}{t}:for each time a permanent has tapped this turn, amass 3. {b}{b}{b}{b}{b}{b}{b}{b}{b}{b}: amass equal to your life total
When Zombie Apocalypse(Wave 2) has been on the battlefield for 15 turns, remove it from play and create 3 0/0 Black Zombie armies.