Double Double

If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead. If an effect would put one or more counters on a permanent you control, it puts twice that many of those counters on that permanent instead.

For each creature token on the battlefield, its controller creates a token that's a copy of that creature. Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)