Your opening simply wastes the banner unnecessarily.
At the end of R3 you have 1 mana left and Ehren is not completely healed.
Compare :
R1 19 Meditating Monk - Mana Crystal
R2 20+1 Hand of Bim Shalla - Ehren - Hand on Ehren
R3 21+1 Hand on Ehren - Martyr's Retribution on Ehren - Alandell
At the end of R3 this opening has 6 mana left, Ehren is Healthy and I still have the Banner available.