In the very beginning of the game, there is an asteroid plummeting toward your planet's surface, where it collides and sends microbe-filled shards into the ocean depths, initiating the planet's animal development. So let's say you've got yourself a T0 planet, and you want to get yourself a new crop of life, but darn it, you've used up all your Staffs of Life. Well, let's say you have a button in your UFO panel that calls in a panspermizoid comet to the planet's surface, re-enacting what you experienced at the beginning of the game. Kind of like the monolith in a way, elevating a planet into the Creature Stage. This way you get a fresh crop of new creatures, filling all 9 animal slots. Not instantly, of course, only after you come back later. (have to give those little microbes a chance to evolve into Early Creatures, and then into regular ones.) This way, you have your own mortal genesis tool, just as crop-circles are your small-scale version of a monolith, etc.

a T3 planet with no animals on it

Does not compute.

Good point. Edited.

Great idea if only if only we had one...or inifite amount of them... maybe a finit number acording to how many planets you have. meh.

I think its implied that the planet that was hit by the meteor was already a stable one and capable of holding life. the comet simply introduced life to it. or maybe im wrong

Well then the only solution would be a T1 planet with a stable ecosystem but no animals. The planet could then become T3 at just about the time the Early Creatures die off, and the more evolved Creatures have dominated. The bottom line, and point to this whole suggestion, is a way for mere mortals to seed random creatures, rather than just seek them out. Seeking them out is the next best thing, as it is much cheaper, but more time consuming. That's the way these tools are all presented to us. There's always a faster, more expensive alternative to the things we can do ourselves, and for every ridiculously effortless effect we can muster with some super-limited god-like tool, there's a gray-area tool of mediocrity, which requires a bit of money, and a bit of time, to accomplish a goal that could otherwise be handled by either end of cost/effort the spectrum. That's what the Planet Seeder is. The middle-point between seeking out new worlds full of life you've never seen and terraforming a planet manually to host them, and using the Staff of Life.