Mabaya, Coven Reborn

Hexproof, deathtouch
{4}: Mabaya loses hexproof. Any player may activate this ability
{b/g}{b/g}: Mabaya gets +1/+1 until end of turn
{b/g}{b/g}{b/g}{b/g}: Creatures your opponents control
get -1/-1 until end of turn