Su-Ram, Blackwater Ancient

Su-Ram, Blackwater Ancient enters the battlefield with X +1/+1 counters on it.
{1}, {t}, Remove a +1/+1 counter from Su-Ram: Search your library for an instant or sorcery card with converted mana cost equal to the number of +1/+1 counters on Su-Ram. Reveal it and put it into your hand.
{u}{b}, Sacrifice another creature: Put a +1/+1 counter on Su-Ram.