Vindictive Vampire 4 mana is a lot, but in sacrifice decks, sometimes you really, really need one more card that drains and gains, and Vindictive Vampire is happy to be that card if you need it
Once you've landed on an adventure card that falls in the discover range, you can either cast it as normal, or cast the adventure spell if its mana value also falls in the appropriate range
Now that some cards, like Overgrown Pest, reference double-faced cards in their rules text, we've officially let meld cards join the double-faced card family to avoid player confusion
The effect is even better on this reprint as it is written crudely onto a piece of tape, making it more fitting for the horrifying task of ripping the card up into pieces for some mana
If you were calculating the odds of opening a given card, this would be 50
When you get to take your time, its an indomitable threat that dominates the game and wins all by itself