Door to the Forbidden Jungle

{t}: Each player creates a 1/1 red and green Dinosaur creature token with devour 2. (As the token enters the battlefield, that player may sacrifice any number of creatures. It enters the battlefield with twice that many +1/+1 counters on it.)
All Dinosaur creatures have "{4}, {t}: Populate. (Create a token that's a copy of a creature token you control.)"
Some doors should never be opened.