Zer0, A Number

First Strike, Menace
B0re: (When Zer0, A Number attacks, if an opponent controls a creature with 6 or more Toughness, destroy one creature an opponent controls)
Many Must Fall: (After combat, you may select up to X creatures as targets, where X is the number of permanents that left the field this turn. Deal damage equal to Zer0, A Numbers power to these targets)