Naseiju, the Sacred Tree

Saprolings can't attack you or a planeswalker you control.
{t}: Add {g} to your mana pool OR put a 1/1 green Saproling creature token onto the battlefield under your control.
{5}{t}: Target opponent puts 5 1/1 green Saproling creature tokens under their control, then you add {g} for each creature that opponent controls to your mana pool.