If you're casting this before going off, you're going to cast 6-7 more spells, so lose 6-7 life. If you fizzle, you're most likely just dead as you don't get a second chance. You'd need to run more bounce spells than usual to mitigate that.
For that much life and mana, I think I'd rather cast Infernal Contract, it's better in multiples and you know the cost when you play it.
Also, the artwork makes me think of Michael Jackson.
I'm curious on exactly how Though Scour/Dredge works regarding showing the cards you put from your library in your graveyard. I'd like to know if you have to reveal the order those cards were on top of your library before putting them in your graveyard in the order of your choice.
Thought Scour: Target player puts the top two cards of their library into their graveyard.
Dredge (If you would draw a card, instead you may put exactly five cards from the top of your library into your graveyard.
Rule 404.3 states "If an effect or rule puts two or more cards into the same graveyard at the same time, the owner of those cards may arrange them in any order."
To be noted that it doesn't have any downsides if your hand is empty, but you'd need a very specific build to make that work consistently, and it would rarely be a turn 1 discard. Between Duress, Thoughseize and Inquisition, I really don't see why this would make the cut.
Seems very situational. If you're on the play, it won't come down on T1. On the draw, you need to hope opponent has T1 Shaman or Rootwalla. Even if they do, it trades with Rootawalla or Vengevine and seems unlikely to connect.
Not sure against what other deck you'd bring that in, but against Survival it seems heh.