Alex_soldier
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Yes, all the creatures are decent; it depends on the faction and the situation.
Sprites (+4 archers) can be effectively used to overwhelm a strong stack.
Phoenixes – no need to comment!
Vampires are good in a group. Bone dragons, for some reason, I don't particularly like...
Warlocks are more interesting in this regard (possibly due to the number of flying units):
Gargoyles are mainly used as cannon fodder, blocking archers in small groups.
Griffins are good in combination with magic (speed, rage, hide).
Red dragons get a bonus if they attack Dragon City.
And rock golems are a great find for Wizards. With such HP, you don't have to be afraid of small skirmishes anymore!