I take it that this card would be a common, then? Sudden Impact is a situational and weak burn spell (not to mention outclassed by Runeflare Trap), and this is a straight-up downgrade in most situations. For an uncommon version, you could have each player draw 2 cards first, which would at least make it more Nekusar-friendly.
Knowledge is Painful 2BB
Sorcery
Each player loses life equal to the number of cards in his or her hand.
Just to riff:
Knowledge is Power2BB
Sorcery
Any number of target players each draw two cards. Then each player loses life equal to the number of cards in his or her hand.
Sorcery
Each player loses life equal to the number of cards in his or her hand.
Just to riff:
Knowledge is Power 2BB
Sorcery
Any number of target players each draw two cards. Then each player loses life equal to the number of cards in his or her hand.
UBRKess, Dissident MageUBR - Controlling Dissidents
GRhonas the IndomitableG - Indomitable Four Drops
WUBOloro, Ageless AsceticWUB - Loot & Renanimate
Sorcery
Target player draws two cards, then loses 2 life.
Then, you gain life equal to the number of cards in that player's hand.