So Nym's special critical effect is to force the Defender to discard a defense token when he rolls a Blue Critical. Naturally everyone is thinking kill that brace token!
However he has a 25% chance to get his crit off. In a game of 6 turns he might get 3-4 shots off where he might land the blue crit. That means in a game he might kill 0-2 defense tokens at best.
So some strategies to overcome this have naturally included upgrades like Adar Tallon and Yavaris, effectively giving Nym 2-3 shots per turn, increasing his chances somewhat.
Wave III offers Bomber Command Centre and Toryn Farr, allowing a Bomber dice to be rerolled and a blue dice to be rerolled respectively.
So now if you are flying Nym, each time he attacks you have 3 chances of fishing for that blue critical, on top of any Yavaris or Adar Tallon shenanigans!
Just something i'd thought to share in case no ones thought of it yet....