Sets released: Guildpact, Dissension, Coldsnap, Time Spiral

Major changes:

  - Coldsnap changed the 'snow-covered' supertype to 'snow' and expanded
  its use to nonland permanents.
  - Time Spiral introduced a rule to make +1/+1 and -1/-1 counters on
  a permanent disappear in pairs.
  - With the online release of Mirage block cards, the rules for phasing
  were updated.  Phasing out no longer triggers leaves play abilities.
  - Time Spiral introduced suspend, a way of playing a card for less
  mana by having it resolve some turns in the future.
  - Time Spiral introduced split second, an ability that prevents
  players from responding to the spell that it's on.  The flavour is
  similar to that of the pre-6th Edition interrupts.

Some parts © 2009 Advameg, Inc.