My Slifer Numeron deck profile. Slifer is my favorite nostalgia card. He's super easy to summon in this deck. Numeron is super budget and puts a lot of bodies on board to tribute to Slifer. If you don't have Slifer though, your Numeron monsters can win you the game anyway.
I put a bunch of board breakers into the side deck, like Nibiru, Thunderforce, Cyber Jar, and Mirror Force. Mirror Force and Infinite Impermanence work well with Trap Trick so I went with those as side deck options instead of other hand traps. Cyber Jar is great because it's a board wipe/draw 5 that can also put a couple of extra bodies onto the board if you draw into your non-Slifer monsters.
You can probably cut 1 each of Numeron Calling, Planet Pathfinder, and Numeron Wall for 3 of the side deck options, as drawing more than 1 of any of them feels bad. Then maybe swap in some other hand traps into the side deck. This is what I stuck with though.