mtg what cards are legal in standard Are new cards legal in standard events?

Ruinous Intrusion

I know there exist people who collect more than play, but I want to know how people organize cards who frequently build new decks and therefore want to be able to find cards quickly

This can also make building a deck from scratch daunting, there are so many possibilities

Use Zedruu's lifegain and card draw to stay ahead and handle threats

Each Set Booster contains 12 Magiccards, 1 Art Card, and 1 token/ad card, Helper card, or card from The List (a special card from Magic's historyfound in 25% of packs), with a combination of 14 card(s) of rarity Rare or higher and 37 Uncommon, 37 Common, and 1 Land cards