These are designed to pretty much hug your cards like a second skin and will be smaller than standard size sleeves at around 64x89mm, just a touch bigger than the card itself
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What happens next depends on the type of spell you are casting, but typically, it will usually have a one-time effect and then go to the graveyard, or it will become a permanent that stays on the battlefield until it is removed
The occasional wish card in Standard uses the sideboard, and in these cases, you get to assign a 7-card sideboard, but otherwise, it doesnt come into play