A more shocking example is Zarc fusing with the four dimension dragons to create Supreme Dragon King Zarc Game-Breaker: Invoked and lampshaded with Pendulum Summoning, which allows a duelist to Special Summon multiple monsters from their hand at once, and when Pendulum Monsters are destroyed they go in the Extra Deck face-up and can be Pendulum Summoned again, making it harder to permanently get rid of them
You get to make an army of Mites and gain life equal to the amount you created
Other cards to consider include the Stellar Crown Bouffalant, to reduce the damage your Terapagos ex takes, and Squawkabilly ex for its Squawk and Seize ability to help with setup
On top of this, it also allows you to gain an additional Normal Summon of a Gem- monster in order to allow the Deck to Normal Summon Gem-Armadillo specifically, as its your best Normal Summon, since it searches for any Gem-Knight monster already
At times, it can become the world's best deck
5 Espeon: This card isn't a Full Art, isn't a Rainbow Rare, isn't an Ultra Rare hell, it isn't even a holo