What might be fun is take some of the creatures in the past that care about Saprolings, and have them merge with Saprolings
It is notable that the rebound flicker happens at the beginning of your turn and this will make the creature you target unable to attack for the rest of the turn, however, creatures with good enter the battlefield effects, like Reflector Mage and Cloudblazer, won't leave you feeling too bad about it
The rest of the proliferate cards are one time instants and sorceries, but they have plenty of utility, from acting as fight spells to counterspells
Its a symmetrical effect, however, but you can get around that by running snow-covered basics: they have a different name to their non-Snow counterparts, so only the snow-covered versions will benefit
For fans unsure of which game each version hails from, the specific title can be found printed in the bottom left corner of the card