2008-10-01
Cycling is an activated ability. Effects that interact with activated abilities (such as Stifle or Rings of Brighthearth) will interact with cycling. Effects that interact with spells (such as Remove Soul or Faerie Tauntings) will not.
2009-05-01
The enters-the-battlefield ability is mandatory. If you're the only player who controls a creature with flying, you must target one of those creatures.