The two surge looks strong, but since Ariad doesn't have a surge you will only get it with the double token. Fairly easy to counter I think.
You can get it without the doubler token, just roll 2x surge? (25% chance)
But if you fail to counter it even once it will come to bite you, especially if it happens in 1st round.
It only lasts for 1 combat round though, not the whole combat.