If you choose to cast a spell for its web-slinging cost, you pay the listed cost rather than its mana cost and return a tapped creature you control to its owner's hand
"Number 39: Utopia" can even reach an ATK of 10000 during the Damage Step if you declare an attack on an opponent's onster with it, negate the attack with its own effect, and then activate the effect of "Double or Nothing!"
Second, he is used to make two of the more powerful boss monsters of the deck, Absolute Zero and Acid, which when combined results in a full board wipe
Locations might prevent characters from being challenged, bolster their stats, and way more besides
If used together with the terminal world, it is possible to make the other party only go to standby, battle, and end
This hypothetically means you can memorize and instantly pick out the card you need