Whenever a -1/-1 counter is put on a creature, you may create a 1/1 green Elf Warrior creature token.
Whenever a -1/-1 counter is placed on a creature, you may put a 1/1 green Elf Warrior creature token into play.
Many horrors take the bait of brave elf volunteers walking alone, only to fall to the blades of rescuers lurking nearby.