Simic 1
Aesi, Tyrant of Gyre Strait is a big beast that would cost you around $10 on its own, while Giggling Skitterspike and Ashaya, Soul of the Wild arent far behind
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Considering there are many precon decks that are 3, 4 or even 5 colours, this deck is a winner in that department.
#12 Perhaps the most notable tournament deck to use Regrowth as anything more than an afterthought was The Deck
Peace Offering's secondary theme is +1/+1 counters , which is fine as a deck but not consistent enough as a win strategy once another player realizes that your Forgotten Ancient or Steelburr Champion are getting out of control