Displaced Dinosaurs

The joke lands before the mechanic does: your legendaries, your artifacts, your Sagas, all of them arriving as dinosaurs, the whole board suddenly stomping around at 7/7. Underneath the gag is a genuinely strange piece of static-ability design. This does not make dinosaurs; it retypes historic permanents into them as they enter, folding a body and a creature type onto permanents built for anything but combat. It is a replacement effect keyed to entry, not a one-time board sweep, so everything you had in play before it resolved stays exactly what it was; the transformation only touches the artifacts, legendaries, and Sagas that come down afterward. Equipment enters as a beater. A planeswalker (legendary, therefore historic) enters as a 7/7 creature that also loyalties. A Saga now attacks while it counts down. That layering opens odd corners: a permanent forced into being a creature can be blocked, targeted by creature removal, and can crew or convoke where it never could before, all in addition to its other roles rather than instead of them. The set of things it touches is broad but not universal (basic lands and vanilla enchantments sit outside the "historic" line), so its ceiling depends on how much legendary-and-artifact material you deploy once it is already in play. That dependence is the tell: a build-around dressed as a bomb, a seven-mana creature whose 7/7 body is almost incidental to what it does to everything you play after it. It is content to be the least interesting dinosaur on the board.