If the situation goes well and the test does not fail unless it is an automatic failure, there is little impact, but as the situation worsens and it becomes difficult to pass the test, it causes damage
The deck usually wins during any turn that a Royal Magical Library hits the field and does not have its effect interrupted by a card like Book of Moon, Ring of Destruction, etc
While paying 6 mana is infinitely worse than paying Shatterstorms 4, youre almost never going to have to worry about paying any mana at all thanks to the fact you can simply sacrifice 2 Mountains instead
Only a small number of these cards exist, and Paul's is the only one to receive a perfect grade of 10, making it even more valuable
Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking Goblin
The customization options extend beyond just the cards themselves