This isn't a gotcha game where your opponent waits for you to blink and then quickly activates abilities
Donkey Kong Land III instruction booklet
Them being indestructible while in attack and their high DEF can make them resilient enough to stay on the board for a turn to be used as a synchro material
Heres an example of a relativley cheap but effective Numeron Deck: Full card list: Monster Cards (19): PSY-Frame Driver x1 Swift Scarecrow x3 Numeron Wall x3 PSY-Framegear Gamma x2 PSY-Framegear Delta x1 Ash Blossom & Joyous Spring x1 Unchained Twins Aruha x2 Unchained Twins Rakea x1 Planet Pathfinder x3 Gameciel, the Sea Turtle Kaiju x2 Spell Cards (19): Harpies Feather Duster x1 Terraforming x1 Numeron Chaos Ritual x2 Memories of Hope x2 Numeron Storm x1 Lightning Storm x3 Numeron Calling x3 Numeron Network x3 Forbidden Droplet x3 Trap Cards (2): Jar of Avarice x2 Total Crafting Cost: Normal: 120 (4 Cards) Rare: 300 (10 Cards) Super Rare: 360 (12 Cards) Ultra Rare: 420 (14 Cards) There are tons of more cards that different decks use to help get out Numerounious on the field
That also means that when a card like Endless Evil came out and I wanted to fit it in to try it out, I did and then immediately slotted it out when Mondrak, Glory Dominus was released
Quinton continues to act as a mentor for his brothers, with Quattro claiming he has already surpassed him, and Trey has to learn to keep calm and focused