Necroduality

The other Zombie is the joke, and the payoff. Doubling Season copies tokens and counters; this one copies the creature itself, but only for the tribe, which turns every summoning trigger you already care about into two. The nontoken clause is the load-bearing restriction: the copies it makes cannot themselves see this and spawn a third, so it reads as a per-cast doubler rather than a runaway loop. That same clause also decides how the deck gets assembled, because the value isn't the extra body so much as the extra enters-the-battlefield event. Cast a Gravecrawler and you get one; cast a Zombie with a real trigger and you get that trigger twice. It asks you to treat the Zombie type line as a resource rather than a keyword, and to fill a list with creatures whose entry does something beyond arriving. What makes the effect quietly wide is that it does not ask the doubled creature to be a token or to have died first; it fires on the way in, off any nontoken source, so recursion, blink, and hard-cast reanimation all feed it. The two copies then diverge only by the legend rule and by whatever the originals were doing, which is where the deckbuilding lives.