Getting Synchro Monsters onto the field is the entire goal of Synchro Summoning, and they can be identified by the stark white backgrounds
You can only use each effect of "Shiranui Squire" once per turn
You can only use each of the following effects of "Core of Chaos" once per turn
C Common Ancient Gear Hydra X EARTH Level 7 [ MachineEffect ] ATK 2700 DEF 1700 At the end of the Damage Step, when this card that was Tribute Summoned by Tributing an "Ancient Gear" monster battles an opponent's monster, but the opponent's monster was not destroyed by the battle: You can banish that opponent's monster
That gap between 'cool digital design' and 'real printed card' is where most people get stuck and it's genuinely frustrating when you had a specific moment or person in mind for this card
After all, her first appearance was central to the plot at the time, and he likely wanted to make sure he designed a character the reader could be sympathetic with