Zephinur, Sower of seeds

At the begining of your upkeep, place a growth counter on Zephinur, Sower of seeds.
{t}: Choose one- Put X 0/1 plant creature tokens onto the battlefield, where X is the number of growth counters on Zephiur;
Or remove X growth counters from Zephinur: plant creatures you control get +X/+X until end of turn.