Yawgmoth, the Usurper

When Yawgmoth, the Usurper enters the battlefield, destroy up to one target creature.
Deathtouch, lifelink
Whenever a creature an opponent controls dies,
put an research counter on Yawgmoth.
{b}{b}{b}{b}{b}{b}{b}, Remove seven research
counters from Yawgmoth: Transform him.