GLaDOS, formidable

Defender
When GLaDOS, formidable enters the battlefield sacrifice a creature
At the beginning of your upkeep put 2 poison counters on target player
{x}{x}{w/b}{t}: create x 0/1 turret creature tokens that
have "{t}: turret deals 1 damage to target creature"
{x}{b/g}{t},sacrifice a creature: gain control of
target creature with mana cost x