While power creep has made Serra Angel less relevant in modern Magic its still a beloved card due to its history and its role in defining the early game
This might seem like something that could only happen in Commander with cards like Platinum Angel, and while Commander is probably the most reasonable home for "you can't lose the game" effects, there are actually not just one but two different ways of pulling off this feat in Standard as well
Theres an abundance of ways for you to untap Szeras and sacrifice a few creatures in the same turn to generate a ton of mana since its an artifact, but those creatures need to have cost a lot in the first place
Whenever this creature enters or attacks, put a blight counter on it
They sell a wide range of high-rarity cards, premium promotional cards, supplies, and international version cards
Equipment goes a long way in the hands of capable warriors and the ability to easily get those goods back is excellent with equipment that is also a creature like Lion Sash and Cloudsteel Kirin