A writ of garnishment is available if:
(1) an original attachment has been issued;
(2) a plaintiff sues for a debt and makes an affidavit stating that:
(A) the debt is just, due, and unpaid;
(B) within the plaintiff's knowledge, the defendant does not possess property in Texas subject to execution sufficient to satisfy the debt; and
(C) the garnishment is not sought to injure the defendant or the garnishee; or
(3) a plaintiff has a valid, subsisting judgment and makes an affidavit stating that, within the plaintiff's knowledge, the defendant does not possess property in Texas subject to execution sufficient to satisfy the judgment.