Verrrry interesting... surprised someone didn't think of it earlier. Definitely a cool concept.
It has some serious potential with SoP. Combo This, Sop, and either Dry Spell or Toadfish and you have a very nasty patience "rush" in the making.
After a few turns of growth it will make a very severe counter to most CC (short of rewind or lobotomy like effects).
Will this be considred a "passive" trait or a lobotimizable "skill" ?