The ability is granted as part of the copy effect, which means it will be removed by any effects that would remove abilities regardless of when the effect was created.
2008-08-01
wotc
If an Unstable Shapeshifter is on the battlefield when another Unstable Shapeshifter enters, the first one gets the second one's triggered ability, so it will copy the next creature that enters twice. It will only do so the next time a creature enters, because the second "becomes a copy" effect to resolve will erase the extra triggered ability.
2004-10-04
wotc
When it changes "shape" to a new creature, any "enters" abilities of the creature do not trigger.
2004-10-04
wotc
The copy effect is not targeted.
2004-10-04
wotc
If the creature has power/toughness that is continuously recalculated, so does this copy of it.
2004-10-04
wotc
If a creature enters that has some characteristic or ability set when it enters, the copy does not get to make that choice (because it is not entering. All values are zero and all checks for choices consider the choice not to have been made.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Not Legal
Legacy
Legal
Pauper
Not Legal
Vintage
Legal
Penny
Not Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Legal
Predh
Legal
Who's Online
Live site activity across collectors, guests, and crawlers.