Konrad, Disgraced Syr

Eminence - At the beginning of your upkeep, if
Konrad, Disgraced Syr is in your command zone
or on the battlefield, you may reveal a card from
your hand or the top card of your library. If a
black card is revealed this way, each player loses
2 life.
At the beginning of your end step, if you've cast
three black spells this turn, each player looses X
life, where X is the amount of life that player lost
this turn.