Summoner Blighter

Summoner Blighter's power and toughness are equal to the number of Wizards you control.
{4}{b},{t}: Target opponent loses 1 life for each Wizard you control.
Blighting is a necromatic art that twists and forces ancestral Summoner spirits to grant one great power. Practicing it turns a Summoner into a creature of darkness. The Summoner coven forever exiles anyone of their order who walks this evil path.