Destroy all creatures. They can't be regenerated. Draw a card for each creature destroyed this way.
Cycling



(



, Discard this card: Draw a card.)
When you cycle this card, all creatures get -2/-2 until end of turn.
The cycling ability and the triggered ability are separate. If the triggered ability doesn't resolve (because, for example, it has been countered, or all of its targets have become illegal), the cycling ability will still resolve, and you'll draw a card.