Sunya isn't the most necessary card, but it's a good option to have in the back pocket just in case. I'd say have one ready to go.
Numeron Chaos Gate Sunya - BLAR-EN021 - Secret Rare - 1st Edition. : Toys & Games
Yu-Gi-Oh! Number C1: Numeron Chaos Gate Sunya MGED-EN082 1st Edition Rare NM
Number C1: Numeron Chaos Gate Sunya - Yu-Gi-Oh! Card Database - YGOPRODeck
MGED-EN082 Number C1: Numeron Chaos Gate Sunya – Rare - Maximum Gold: El Dorado Trading Card Mint - Yugioh, Cardfight Vanguard, Trading Cards Cheap, Fast, Mint For Over 25 Years
SD42] First Structure Deck: Overlay Universe cards : r/yugioh
The best Yu-Gi-Oh! Master Duel decks for every summoning type
Numeron Chaos Ritual - Yu-Gi-Oh! Card Database - YGOPRODeck
Number C1: Numeron Chaos Gate Sunya *Modern Graphic Design* Sticker for Sale by Carryneon
Yugioh Numeron Tournament Deck Apollousa Bow Numeron Network Calling Kaiju NM - Israel