Wisp Grovetender

At the beginning of each upkeep, create a 1/1 black and white Spirit creature token with flying.
Whenever a token you control dies, choose one:
— Target creature gets -1/-1 until end of turn.
— Target player loses 1 life and you gain 1 life.
{6}{w}{b}{g}: Return target creature from your graveyard to the battlefield tapped. This ability costs {1} less for each Spirit you control.