R.A.M.O.N.
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1. Naturally, the enhanced Bull is overpowered, it's a complete cheat.
2. Either Woodies or Minotaurs. Woodies have a bonus of 8 + roots, and 65 HP, which are decent attack and defense stats. Minotaurs have the best attack and defense stats + morale and speed.
3. Thunderbirds - speed + attack, and lightning.
The rest are subpar, in my opinion.