There is so much that can be done with this card. I suspect the most balanced way to go about it is costing 8
and for every pair of creatures, another is bred. This would be a brand new card without any effects on it, much like mitosis. As it stands now, the card would create 4 more toads if you have 4 toads, but if you have 1, it would create none.
I could change the wording to reflect my original intention, I just can't come up with something that will fit on the cards.
All pairs of life creatures produce one offspring.
Actually, that works quite well and I could even fit in the idea that the stats reflect the weaker of the pair. That might be too overpowered.
In any case, which do you think would make a better card of those 3 options?