These powers are waay too strong.
The entire suite of unit abilities needs to be rebalanced, but the beta will be far easier to analyze if charge gets kicked the f*** out of the game.
Double strike is also way over powered, especially in combination with charge. I would suggest either making it 33% of accuracy penalty (instead of a flat 30 accuracy). Even better, I would suggest a unit ability named 'ambush' or 'find weakness' or something that has a 1 turn casting cost, then deals double damage with high armor penetration.