When a gift is made over a certain dollar value, I would like the corresponding gift attribute to be automatically applied to the donor.

For example: If John Doe gives a gift of $500, the attribute assigned would be 'Major Donor Prospect'. If John Doe gives a gift of $1,000, the attribute assigned would be 'Major Donor'.

Likewise, if a donor hasn't given a gift of $1,000 or more in the last three years, then their attribute would change from 'Major Donor' to 'Previous Major Donor' at the anniversary of their last major gift.