Tactics for Conflux.

At the very beginning of the discussion, we talked about a combined strategy with upgraded units.
Now, let's model the situation:
Round 1: Cast Mass Slow and Haste on the main forces, while the single units distract.
Round 2: Cast Haste on the Faeries, and together with the Psions, they move away from the upgraded stack... if the single units are still alive, they continue to distract.
Round 3: Cast Haste on the Psions and attack after the Slow, targeting the upgraded Griffons... in total, almost half are killed - 17 mana for 3 casts.
Round 4: We can't attack; we retreat, otherwise the remaining Griffons will kill the Faeries. Only the presence of Lightning, combined with the Faeries and Psions, can finish off the King Griffon, and this is assuming that the Griffon stack in the upper left corner is not near the King Griffon, which is likely.
Even with this approach, if the Griffons still manage to overwhelm the Faeries and Psions, it will take at least another 20+ rounds to defeat them in this way, and there won't be enough mana for Lightning or all the Haste spells.