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So, considering all of this based on just the 3rd level units:
Cerberuses: attack 10, defense 8, damage 2-7, health 25, speed 8;
Griffins: attack 9, defense 9, damage 3-6, health 25, speed 9;
Elves: attack 9, defense 5, damage 3-5, health 15, speed 7;
Golems: attack 9, defense 10, damage 4-5, health 35, speed 5;
Spirits: attack 7, defense 7, damage 3-5, health 18, speed 7;
Eyes: attack 10, defense 8, damage 3-5, health 22, speed 7;
Orcs: attack 8, defense 4, damage 2-5, health 20, speed 5;
Snakes: attack 8, defense 10, damage 2-5, health 20, speed 13;
Ice Elves: attack 8, defense 10, damage 3-7, health 30, speed 6
Based on these stats, we can see that:
1) In terms of speed, nothing can match the Snakes.
2) In terms of health, Golems are in the lead.
3) Ice Elementals deal the most damage.
4) Eyes and Cerberuses have the highest attack.
5) Golems, Snakes, and Ice Elementals have the highest defense.
However, almost all of them have an ability.
Considering this, no 3rd-level unit can withstand an ability like "enemy does not retaliate." This ability covers both stats and turn priority, therefore, the Cerberus is a very good unit