Nest of Scarabs
Enchantment
Whenever you put one or more -1/-1 counters on a creature, create that many 1/1 black Insect creature tokens.
Jason A. Engle
Amonkhet Remastered (AKR)
• #117Rulings
If an effect has you put more -1/-1 counters on a creature than it has toughness, you’ll put all of those counters on it and create that many Insects, even if that makes its toughness a negative number.
(wotc • 2017-04-18)
If a creature with wither or infect deals damage to a creature, the controller of the creature with wither or infect puts that many -1/-1 counters on the second creature.
(wotc • 2017-04-18)
Rulings
If an effect has you put more -1/-1 counters on a creature than it has toughness, you’ll put all of those counters on it and create that many Insects, even if that makes its toughness a negative number.
(wotc • 2017-04-18)
If a creature with wither or infect deals damage to a creature, the controller of the creature with wither or infect puts that many -1/-1 counters on the second creature.
(wotc • 2017-04-18)