Orvar, the All-Form

As the first triggered ability tries to resolve, the spell that caused it to trigger and that spell’s targets are checked again. Ignore any target of the spell that has left the battlefield by that point. If all of the permanents you controlled that were targets have left the battlefield by that point, the triggered ability will do nothing and no token will be created. If at least one permanent you control that’s a target is still on the battlefield, the triggered ability will resolve, even if that permanent is now an illegal target for the spell.

If the permanent being copied is copying something else, the token you create will use the copiable values of the that permanent. In most cases, it will be a copy of whatever the permanent is copying. If it’s copying a permanent or card with X generic mana in its mana cost, X is 0.

If an effect causes a creature with changeling to lose all abilities, it will remain all creature types, even though it will no longer have changeling. This is because changeling applies before the effect that removes it.