Natural Cycle

Kicker - {3}, Discard a card.
When Natural Cycle enters the battlefield,
choose either Day or Night. If Natural Cycle
was kicked, choose both.
At the beginning of your upkeep, if you chose
Day, create a 1/1 green Saproling creature token.
At the beginning of your end step, if you chose
Night, put a -1/-1 counter on target creature.