How do you kill a summoned phoenix?

Haven has an entire army; you can cast a lot of weakening magic on him to reduce his defense:D, and by that time, you'll have a lot of them. But if you use other factions:
The Elves' archers will tear him to shreds!
The Necropolis has Death Knights and Banshees.
Inferno can kill him with archers and cast a lot of nasty magic on him:)
The Fortress can use powerful runes.
The Castle has poison archers, a lot of nasty magic, and dragons.
The Stronghold, of course, has archers:D, and you can unleash Cyclops with Fury on them (free ones are best:)).
In a duel, the best thing to use against him is a Necromancer with his Death Knights: I think everyone remembers the special skill that removes at least one creature; it works great on him!
P.S. The answer turned out to be almost uniform because it's clear to everyone:)