Twilight Prophet

Flying
Ascend (If you control ten or more permanents,
you get the city’s blessing for the rest of the game.)
At the beginning of your upkeep, if you have the
city's blessing, reveal the top card of your library
and put it into your hand. Each opponent loses
X life and you gain X life, where X is that card's
converted mana cost
Berserker summoned to the Holy Grail War.