Having a card psa graded and rated in this system adds value, and is almost an expected etiquette when selling particularly old cards (like a charizard, a mewtwo, a blastoise or the legendarily rare pikachu illustrator card for example) that are high in value
The goal of the deck is to passively flood the board with a huge token army as you do basic things like draw cards, ramp, interact, and protect your board
the Level of that monster or this card becomes the Level of the other, also you cannot declare an attack for the rest of this turn, except with Xyz Monsters
EOJ-SP053 Enemy of Justice DP05-SP025 Duelist Pack: Aster Phoenix Yu-Gi-Oh
Spells like One Day of Peace do this perfectly alongside the other, much more important aspect of an Exodia deck - getting cards from your deck to your hand
You really dont need to do too much