Desynchronization

Mass bounce is old (Evacuation, Whelming Wave, the various sweep-to-hand effects), but the target selection here is drawn along an unusual seam: the "historic" batch. That word is a grouping term rather than a single supertype, and the grouping is what makes the design tick. It nets together a supertype (legendary), a card type (artifact), and a subtype (Saga), then spares everything under that umbrella while returning the rest. Where a sweeper normally sorts by function (all creatures, all nonland permanents), this one sorts by pedigree. A field of vanilla tokens and rank-and-file creatures gets wiped back to hand; the singular pieces (a legendary commander, an artifact engine, a Saga mid-chapter) stay put. That inversion drives the whole thing: it punishes the go-wide, undifferentiated board while leaving the built-around, marquee permanents in place, which runs close to the opposite of what a symmetrical reset usually does. As an instant, it holds the window open for a blowout during a declared-attackers step or in response to a token-generation trigger, resetting an opponent's development while your own historic threats sit through the wave. The catch is that the filter only breaks your way if your board is built to survive it: stack it with legendaries and artifacts and the asymmetry is yours; flood the board with ordinary creatures and you are as exposed as your opponent. It is a reset that rewards building around a batch most sweepers ignore entirely.