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I'm for a harpy-cyclops-bird combination. Harpies are good because they move away after an attack, avoiding retaliation. Cyclops because they are ranged attackers, and powerful ones at that. And a bird because of the 4+growth (+ potentially nobility) and lightning strike attack.
The base growth for thunderbirds is 3. A growth of 4 per week is only possible after a lair or nobility level 4. By the way, it's good for attacking. If it lived longer, it would be even better.