If an ability triggers "whenever you roll a die," it will trigger whenever you roll any die, including the planar die. This is a change from previous Un- rules. Some abilities use the result to determine part of the effect. If you get a non-numerical result (currently just the planar die, but the future is long), that part of the effect won't do anything.
Celebr-8000
If you roll a result higher than 6 because of modifications to the results, Celebr-8000 won't gain any ability from that roll. If you roll doubles of such a number, it will still gain double strike until end of turn.
If a die is rerolled, the original roll essentially never happened: it doesn't cause any abilities to trigger, and no effect that cares about die rolls will consider it.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Ralph Horsley
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