Goddess of Growth

Whenever a creature you control deals combat damage to a player, create a Green Artifact creature token called Mana Sapling with "T: Add {g}" and "You don't lose unspent green mana as steps and phases end."
Whenever you cast a creature spell with mana value 7 or greater, create a 1/1 Green Beast creature token with Trample and "{g}: This creature gets +1/+1 for each mana in your mana pool. Activate this only once each turn.