Vadimh
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I didn't quite understand about the wyverns, how exactly? Do they have a spell that increases attack?
And regarding the quick lightning, I'll give you a tip on how to use it quickly. Position the leader close to the daughters, then use them to attack the daughters, so they move faster, sacrifice a goblin to them, then use the leader to speed up the daughters again. With this procedure, you can manage to cast chain lightning even before the start of the second turn, because the leaders have good initiative and often go first.
As for the speed of the shamans, if the AI goes first, you can use your shamans to cast speed boosts/slows on those stacks, but if it's the player, they will receive the opposite effect.