Slaanesh, Prince of Pleasure

Eminence — At the beginning of each player's combat put a temptation counter on target creature that player controls.
Indestructible.
Creatures you control with temptation counters on them have lifelink.
{4}{w}{b}: Gain control of target creature with three or more temptation counters.
As long as there are less than six creatures with temptation counters on them, Slaanesh isn't a creature.