Thanos, Shrek Lord

Thanos, Shrek Lord enters the battlefield with stone counters equal to the X paid in it's Mana cost
If Thanos, Shrek Lord enters the battlefield with 4 or more stone counters on it, as an additional cost sacrifice a creature
If Thanos, Shrek Lord entered the battlefield with 5 or more stone counters on it, choose half of the number of players in the game, rounded up, lose the game