Yuya use's a summoning call pendulum summoning. If you don't know what pendulum summoning is then lit me till you what is is when you have a monster that is pendulum they need to be balance like if you have 1-8 you can summon monster 2-7 and if you don't use it right then you can't pendulum summon any thing if you don't have them the same.
the Pendulum can have many number to see waht can work 1-8 pendulm monsters with that can summon monster 2-7 and you have 2-6 pendulm monsters with that can summon monster 3-5 and you have 0-13 pendulm monsters with that can summon monster 1-12
Timegazer Magicain it a monster at can help when you are pendulm summoning he has a effect. Where each turn, the first card(s) in your pendulm zone that would be destoryed by an opponet's card affect,is not destoryed. And that can help when you dont want your monster to be gone. Stargazer Magician is a monster at can help when your pendulm summoning his effect is onec per turn, when exactly 1 pendulm monster you control (and on other cards) is returned to your hand by an opponet's card effect(except during the damage step): you can soecial summon 1 monster from your hand with the same name as that returned to the hand.
ODD-Eyes Pendulum Dragon is a monster that can be a strong buddy to have when you are in battle with him you can add 1 pendulum monster with 1500 or less ATK from your deck to your hand. Odd eye was a normal monster when Yuya pendulum stated to glow it transformed him in to a penudulm monster. If this card battles an opponet's monster, any battle damage this card inflicts to your opponet is doubled. Old Eyes has many forms when he fusion,xyz,or synchro when he is with his brother and I will till you about thime.