Drawing cards at Hogwarts

"Good morning." A soft voice came from Tom's side, and a bright-eyed old man appeared beside them.

Professor McGonagall stepped forward and said to the old man, "Good morning, Ollivander, I've brought a student to buy a wand today."

"Oh, no problem, great," Ollivander nodded, then looked at Tom and pulled out a silver tape measure, asked Tom about his usual hand, then measured his arm length, then Ollivander measured Tom's leg length, height, head circumference and other measurements, causing Tom to frown.

Tom asked, "Sir, why all these measurements? I'm just here to buy a wand..."

"Because every Ollivander wand is unique," Ollivander said in a proud tone, "we've been doing it for generations, measuring the physical parameters of our customers before offering them a wand, and then choosing a wand based on those parameters."

"But I'm only eleven now, so these parameters will change in the future." Tom was confused, "And aren't they supposed to give me a wand directly after these measurements?"

Ollivander had a happy look on his face like a teacher being asked an interesting question by a student.

"You are quite right, the body will grow, but I only need a child's data before it develops, and based on the relationship between this data, I will determine a range and give you a wand within that range," Ollivander said happily.

"I see," Tom said thoughtfully, looking around the room at the thousands of boxes of wands, and thinking that he really should narrow it down a bit.

As he spoke, Ollivander finished taking his measurements. He led Tom over to the pile of wands, but before he could choose one, a box shook and the next moment it flew out of the thousands of boxes and landed firmly in Tom's hand.

"Oh? A very rare phenomenon." Ollivander had a surprised expression on his face, which seemed to be rare. He looked closer at the box and it showed a very complicated expression.

"It's this wand..." Ollivander seemed to get lost in his memories, and it took him a moment to realize that there were customers in the store.

"I'm sorry, I'm sorry. This wand was my father's last creation. It's been here for decades and he didn't recognize any wizard..." Ollivander looked very relieved and seemed genuinely happy that the wand had an owner.

"Which wand core do you think is the most powerful?" asked Ollivander to the pair, but he didn't wait for Professor McGonagall's answer before saying to himself, "All wizards think the tail feather of a thunderbird is the most powerful wand, but it's not. The horn of the Horned Water Snake is the most powerful core. The core of the wand of the founder of Ilvermorny is Horned Water Serpent. Horned Water Snake horns can grant its bearer the ability to understand the Parseltongue and alert the owner of danger, it has incredible power."

Ollivander gently opened the box and there was a very beautiful wand, long and slender, with protrusions that looked like a coiled snake, and a handle at the end of the wand with a hollow hole.

The wand has a noble, strange and luxurious feel to it.

"Horn of the Horned Water Snake, acacia wood, thirteen inches long, if you can get the gem from the forehead of a Horned Water Snake, it can also be set in the hilt, the gem from its forehead gives the user invisibility and the ability to fly."

Tom was a bit surprised that the wand had its own invisibility spell....

"Take it, lad, and try it." Ollivander handed the wand to Tom.

Tom took the wand and felt a warmth in his fingers, felt a sense of excitement and there was a faint sound of wind and thunder around him.

"Very good, excellent!" Ollivander looked very happy,

He put Tom's wand in a case and wrapped it in brown paper.

"Here, it's yours. He has chosen you." Ollivander handed the wand to Tom, who took out seven Galleons and bought the wand, as Ollivander bowed and escorted them out of the store.

Tom looked at his character bar and saw that there was an additional item in the magic item section.

[Wand (Acacia wood, Horned Water Snake horn, thirteen inches)]

[Star Rating: 5 stars]

[Compatibility: 96%]

Even though a wand cost only seven galleons, it was still a burden on Tom's budget.

"Have you thought about how you're going to pay the money back?" asked Professor McGonagall with some curiosity, wondering how an eleven-year-old boy could earn twenty galleons.

"I believe Gringotts has a service for exchanging Muggle currency and gold galleons." Tom looked at the tall, imposing building in the distance.

"Yes, but there is a limit. Those goblins are pretty smart, some of them even have degrees in economics from the Muggle world," said Professor McGonagall.

"Then I suppose you can get more for the gold. They're goblins." Tom had already spotted the loophole in the rule: gold was a natural currency, and goblins would dislike pounds, but not gold.

"All right, but where are you going to get the gold?" Professor McGonagall felt the boy in front of her getting more and more interesting.

"It's not hard." Tom knew just the place to go to get the gold, and it was a good place for him.

Professor McGonagall nodded and, without asking any more questions, disappeared using the 'Apparition' charm.