Necrosan's Candle

{x}{x}, {t}: Add or remove X fate counters from Necrosan's Candle.
{t}, Sacrifice Necrosan's Candle: Each player sacrifices all creatures he or she controls with toughness X or less, where X is the number of fate counters on Necrosan's Candle.
"Every living thing has a constantly weakening flame inside them. What happens when said fire dies is solely my decision." - Necrosan, Aurora of Death