Corrupted Summoner

{2}, {t}, Sacrifice an artifact, enchantment, or
token: Search your library for a Mercenary
permanent card with mana value less than or
equal to the sacrificed permanent's mana value
plus 2, put it onto the battlefield, then shuffle.
{3}{b}{b}, {t}: Each opponent loses X life and you
gain X life, where X is the number of
permanents you've sacrificed this turn.