When a monster declares an attack: You can Special Summon 1 Dinosaur monster from your hand, ignoring its Summoning conditions, also you cannot Special Summon for the rest of this turn, except Dinosaur monsters
However, parts certainly feel messier and more cumbersome, forcing themselves into the more simple and enjoyable gameplay loop, making it less fun in the long term
The diverse abilities on attack or block really make the card, bringing this awfully close to a planeswalker on an efficient body
Itadori_Yuji didn't specify the playstyle for this deck
Assuming you're playing Type I rules (remember that Richard only lets you use cards legal in the format you're playing), then yes
This gem mint holo Snorlax is priced at a comparatively modest $500, whereas this similar card has been priced at a more exorbitant $885