Beanvine Mazemaker

Plant {3}{g}{g} (During your turn, you may pay {3}
and exile this card from your hand. When you do, create two 0/2 green plant creature tokens. As long
as this card remains in exile, you may cast it for it's Plant cost by sacrificing a plant as an additional cost
to cast it. Plant only as a sorcery.)

When Beanvine Mazemaker enters the battlefield and at the beginning of your upkeep, create a 0/2 green plant creature token.