In an old story of mine, there happened to be a species of humanoid who could produce a variety of mutants and hybrids from stolen and harvested DNA, sperm, and biological tissues. They would produce organic embryo-holding pillars, or eggs, or sacks to contain their countless highly differentiated young until they were fully developed, and hatched into whatever bizarre spawnling their given "scrunch" of DNA allowed. I found this grody form of mass spawning very fascinating and alien, and wondered if a body of perfectly sustained cultures really could reproduce anything from its dumpster of stolen DNA and tissues from foreign species.
In hindsight, it was not a very realistic concept for a relatively-small-for-the-scenario humanoid to mass-spawn infantile creatures from thin air, sometimes in the dozens or hundreds. This had me thinking about the plausibility of a creature specifically built for "creature building" as a reproductive concept. Hypothetically, I am wondering what baseline type of creature(Be it a plant, insect, or jelly, or mammal, or some alien thing with the ability to do "X" with samples of organic tissue, and so on) would be best suited for this task instead of an over-sized humanoid.
Currently, the guidelines for what such a creature would have at their disposal would be this:
The creature can incubate and preserve all forms of tissue, organic matter, DNA, cells, and so forth within itself- and its body can naturally 'feed' its samples no matter their complexity in order to keep them alive and of use without breaking them down into components that rob them of being from a different creature entirely.
It is thought that once this creature has a decently sized or reproductively geared sample, it can always replicate this sample and use it for spawning purposes.(Possibly, this could mean growing the creature from scratch, and harvesting its ...cough...fluids. Although that's yet to be a system I can currently imagine.)
- The internals of this creature are directly capable of manipulating the growth and creation of cells, and can begin production of whatever is necessary to make certain fusions or growths of things to occur.
- Its method of incubation for most creatures is universal, not only in method, but in compatibility with what it can grow. (Example: It will always grow a fetus in a sack on a pillar, but all fetuses will be able to safely grow under the given circumstances)
- This creature cannot reproduce anything, even akin to itself, without use of its 'belly' of samples from other species. That means all children it has most similar to itself will be hybrids... or it will only have offspring that are of another genus. (To add to this point, we can safely assume this creauture can regenerate itself, or just simply does not completely die at all- preventing it from hitting extinction)
TLDR; What is the best type of creature to act as a mass mutation-causing, clone-making baby machine?
(I did not add 'reality-check' to this question due to how implausible or strange it seems. I do not know enough about this subject to understand how ludicrous the concept may be. I also would like to leave it open to scientifically impossible, but still somewhat more compatible concepts.)