But it gives me access to the ideal 4 colours for this deck
This keeps Polymorph fodder up, all while having creatures in the air that can attack for damage if need be.
If some of the creatures are illegal targets as the first ability of Jade Seedstones tries to resolve, the original distribution of counters still applies and the counters that would have been put on the illegal targets are lost
That's very Golgari, but now you trade green for blue, and in doing so you open yourself up to mass card draw, filtering, counters, bounce, stealing, copying, and many more effects
Be aware that some players will fear Vito, Thorn of the Dusk Rose because of those Sanguine Bond combos and try to kill you on sight