I don't know is this is viable or just a meme, but imagine putting Hakkar, the Soulflayer in a mill Druid with two Dreampetal Florists or the Twig of the World Tree. Burn through your entire deck and then play King Togwaggle and either a discounted copy of this card or refresh your mana crystals to play this card at full cost and Innervate/Naturalize it. Because the only card in your (now their) deck is the corrupted blood, it will endlessly draw itself and deal 3 damage, instantly killing the opponent. In effect, instead of using Naturalize or Azalina Soulthief to prevent them from switching back you just murder them the next time they draw a card (which is before they have a chance to interact with the board in any way).
If this catches on, it could be really scary and difficult for many decks to deal with. Some decks can survive against mill druid, but this combo would kill any opponent, at any life/armor total, no matter what secrets they had in play (even if they had an Ice Block in wild).