Titanic Decay

Deathtouch, Infect, Reach, Undying
{b}{t}: Remove a +1/+1 counter from Titanic Decay: Put a 1/1 black Ooze creature token into play. It has deathtouch and infect.
When Titanic Decay enters the battlefield, sacrifice X creatures, then put X +1/+1 counters on Titanic Decay.