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There are only three Emissaries, so I don't think a 5-drop would be excessive.
It was an interesting match. Control Warrior can heal like crazy if it buffs itself with three Lucians (all three died in a non-standard way; one was slightly "cooled down" by Lilia beforehand). It was also very interesting to circumvent the 4-damage limit, but I managed to do it in two rounds (first, a 0-bolt + three Scarabs, leaving the opponent with 5 HP; I miscalculated a bit, and one Scarab bit for 3 damage; then, Ma'hes procced, killing the evolved Grimnir; the naive Warrior girl thought that the evolved creature would somehow delay me, and I had exactly 2 power points left for a Scarab). Lilia also "cooled down" the second Leonidas, and I killed that nasty creature before it could activate its ability. So, yes, it wasn't exactly a perfect OTK, but if desired, OTK Forest can defeat Durandal Warrior. The opponent didn't really threaten me, so I just took out all the Lucians and then calmly ate its face.
But imagine my face when I bit half of its face off, thinking, "Okay, the Warrior doesn't have healing, and if it casts Durandal, I'll figure something out," and it started spamming Lucians like crazy and healing back to 20, even proccing a few through Sasha.