Braik, Flesh Titan

Braik, Flesh Titan enters the battlefield tapped.
{x}{x}: Put X +1/+1 counters onto Braik, Flesh Titan.
At the beginning of your upkeep, sacrifice a number of permanents equal to the number of counters on Braik, Flesh Titan.
Whenever a creature is sacrificed, put a +1/+1 counter on Braik, Flesh Titan.