Once you can't, you lose everything you gained
(Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.) Search your library for a card, put it into your hand, then shuffle
Well, this is one of the densest settings Wizards of the Coast has released in recent years, full of factions and different alien species, but we'll do our best to summarize
Jumpstart booster packs are loaded with cards from throughout Magic The Gathering (MTG) history plus 37 cards that get their first-ever printing and dozens of cards from Core Set 2021 (M21) Draft Booster Boxes There are 36 packs in a draft booster box, usually with 10 commons, three uncommons, a rare or mythic rare, and a basic land, plus the merchandising/token card
Its controller mills that many cards, then exiles cards from the top of their library until they exile a nonland card with a different name than that spell