ソーサリー
あなたの手札を捨てる。 カードを7枚引き、その後カードを3枚無作為に選んで捨てる。
You discard your hand as part of Drastic Revelation’s effect, not as an additional cost. If you have no cards in hand at this point, you simply don’t discard any; the rest of the spell will still have its effect.