Kozilek's Shrieker

Oracle Text

Devoid (This card has no color.)

C: Kozilek's Shrieker gets +1/+0 and gains menace until end of turn. (It can't be blocked except by two or more creatures. C represents colorless mana.)

Card Rulings

1/22/2016 If Kozilek’s Shrieker gains menace after it’s been legally blocked by one creature, it will remain blocked.
1/22/2016 Multiple instances of menace are redundant.