Howl of Shabriri

Until end of turn, if a source would deal damage to a permanent or player, it deals double that damage instead.
Each player may discard their hand, then draw that many cards plus one. If they don't, they lose life equal to the number of cards in their hand.
Madness {u}{b}{r}

It is said that the sickness of the flame of frenzy
began with Shabriri, the most reviled man
in all history.