There’s a shit ton of loopholes in that.
Many people, have multiple standard decks, so I would specify ONE deck.
The meta game thing also might open you up to someone saying that their current deck is untenable because it doesn’t score 1st place all the time now and instead only ranks 5th, and they could argue that they need ANOTHER deck to be “competitive”.
By having no spending cap, you’re also opening yourself up to shady players trying use that to buy cards that they don’t need, under the excuse that they’re “trying them out”, which could easily skyrocket your costs from about $300 a deck, to them just going out and buying whatever $20-$40+ dollar cards they want, just to “try” them out and then sell on the side.
Modern, vintage, standard are formats of magic.
It’s kind of like a “Season” in a way...
Vintage is basically allows you to play any card ever made
Modern allows you to only play card printed since 2003.
Standard allows you to play only cards printed during the past two “Season”s. In essence, that basically works out to cards that ave more or less been released over the last 2 years.
Every year, a new “season” starts, and new cards are released in thematic blocks (there’s usually 2-4 blocks throughout a season/year.) and usually printed and reprinted until the end of the year
Every time a new “block”s are introduce (usually once a year) another gets pushed out.
Certain card can also become “banned” from Standard from time to time (because they realize they are game breaking powerful).
Usually the a weave cost per standard deck is about $300. It might last you anywhere from half a year to a year and a half, depending on how many cards you have that are phased out or in.
By comparison, in modern and vintage, the cards are relatively static, but because they are, that also means that there are basically no reprints of the cards that exist, which means prices skyrocket.