Jumpstart is the name of Magic: The Gathering's revolutionary new supplemental product. It is sold in boosters meant to be drafted, if in a completely novel way, whose only prototype in Magic is the silver-bordered set Unsanctioned. In that Un-set, you would take two of the five standalone preconstructed half-decks and smash them together to create your playing deck. Jumpstart takes this concept to its extremes by creating 121 unique 20-card boosters, each only containing cards linked by a common theme, plus the appropriate basic lands to cast them. There are 46 different themes, ranging from Cats to Dinosaurs and from Discard to Lightning. Most themes have up to four booster variations, but for some of them, like Unicorn and Rainbow, only one exists. You pick two boosters, shuffle them together, and that becomes your 40-card deck. Quick, simple, and never twice the same.
Each booster is composed of at least one rare or mythic (one in three packs includes an additional rare) and usually about eight basic lands, wherein one of which will have special art matching the theme. Boosters have themselves a rarity, with the strongest lists showing up at less common rarities. Players won't know what a booster will contain until they open it, but the 121 possible variations of the 46 themes are fixed and public. Here are some examples of the rares that act as "flag-bearers" for the themes.
The cards that appear on Jumpstart encompass the whole history of Magic: The Gathering with 417 reprints from older sets, while 120 are Core Set 2021 cards that maintain the M21 logo. A few are completely new, though. Some of these 37 new debuts that especially stand out are legendary Unicorn blinker Emiel the Blessed; Pirate lord Corsair Captain; discard feeder Tinybones, Trinket Thief; Elf-ramp payoff Allosaurus Shepherd; and new counter-doubling enchantment Branching Evolution.