1

                                                                    EXHIBIT 99.2

      VOTING INSTRUCTIONS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF

                            DEVON ENERGY CORPORATION

The undersigned holder of Exchangeable Shares of Northstar Energy Corporation
hereby directs CIBC Mellon Trust Company (the "Trustee") to cast a number of
votes equal to the number of Exchangeable Shares owned by the undersigned in
accordance with the instructions indicated on the reverse side hereof at the
Special Meeting of Stockholders (or any adjournment thereof) of Devon Energy
Corporation to be held at the Renaissance Oklahoma City Hotel, Ten North
Broadway, Oklahoma City, Oklahoma, on          , 2001, at     a.m., local time.
The Board of Directors recommends a vote "FOR"the matter set forth on the
reverse side.

PLEASE SIGN ON THE REVERSE SIDE OF THIS CARD AND RETURN IT PROMPTLY IN THE
ENCLOSED ENVELOPE.

WHEN PROPERLY EXECUTED, THE TRUSTEE WILL CAST A NUMBER OF VOTES AT THE MEETING
EQUAL TO THE NUMBER OF EXCHANGEABLE SHARES OF RECORD OWNED BY THE UNDERSIGNED IN
THE MANNER SPECIFIED ON THE REVERSE SIDE HEREOF.

IF NO INSTRUCTIONS ARE GIVEN, NO VOTES WILL BE CAST ON BEHALF OF THE
UNDERSIGNED.

<Table>
                                                                     
SEE REVERSE           CONTINUED AND TO BE SIGNED ON REVERSE SIDE           SEE REVERSE
   SIDE                                                                       SIDE
</Table>

                                  DETACH HERE
   2

1. Approve the issuance of Devon Energy Corporation common stock in the merger
   contemplated by the Agreement and Plan of Merger, dated as of August 13,
   2001, by and among Devon Energy Corporation, Devon NewCo Corporation and
   Mitchell Energy & Development Corp., as it may be amended from time to
   time.  [ ] FOR       [ ] AGAINST       [ ] ABSTAIN

                        MARK HERE IF YOU PLAN TO ATTEND THE MEETING  [ ]

                      MARK HERE FOR ADDRESS CHANGE AND NOTE AT LEFT  [ ]

                                                 Please sign exactly as your
                                                 name appears at left,
                                                 indicating your official
                                                 position or representative
                                                 capacity, if applicable. If
                                                 shares are held jointly, each
                                                 owner should sign.

                                                 Signature:
                                                 -------------------------------

                                                 Date
                                                 -------------------------------

                                                 Signature:
                                                 -------------------------------

                                                 Date
                                                 -------------------------------