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Magic: The Gathering Comprehensive Rules Changes

Masters Edition to Lorwyn (Single Change View)

General changes

Old rule (Masters Edition) New rule (Lorwyn)

503.4.

Some effects cause a permanent that's copying a permanent to copy a different permanent while remaining in play. The change doesn't trigger comes-into-play or leaves-play abilities. This also doesn't change any noncopy effects presently affecting the permanent.

Example: Unstable Shapeshifter reads, "Whenever a creature comes into play, Unstable Shapeshifter becomes a copy of that creature and gains this ability." A Shapeshifter is affected by Giant Growth, which reads "Target creature gets +3/+3 until end of turn." If a creature comes into play later this turn, the Shapeshifter will become a copy of that creature, but it will still get +3/+3 from the Giant Growth.

503.4.

Some effects cause a permanent that's copying a permanent to copy a different object while remaining in play. The change doesn't trigger comes-into-play or leaves-play abilities. This also doesn't change any noncopy effects presently affecting the permanent.

Example: Unstable Shapeshifter reads, "Whenever a creature comes into play, Unstable Shapeshifter becomes a copy of that creature and gains this ability." It's affected by Giant Growth, which reads "Target creature gets +3/+3 until end of turn." If a creature comes into play later this turn, Unstable Shapeshifter will become a copy of that creature, but it will still get +3/+3 from the Giant Growth.