sword & shield lost origin booster box Shield: joined by Kyurem VMAX Sword & Shield: Lost Origin

[11] It was shown that she fell in love with him when he saved her once

- Junk Warrior (SDSE-EN043) - Structure Deck: Synchron Extreme - 1st Edition - Common : Toys & Games

None of them have ever been reprinted, leading to price tags in the thousands even without them garnering attention from collectors outside Magic so far

I have been discussing this with a lot of people and it is easy to agree on the fact that it was when the Pendulum monsters arrived

Pretty sure that's just an educated guess based on past special sets and a leaked card's set symbol rather than anything definitive

But, if you make it costly and/or slap a restriction(s), it may be outclassed by Iron Wall