(3/2) Activate any 1 Deactivated card in your Cooldown Meter.
Here I'm assuming that "Activate" means that you would turn the card from deactivated to activated in your cooldown, so for example if an opponent made you put cards into your cooldown deactivated, as Azyn does with CORRODER IMPACT!, you could then activate it for passive buffs.
I'm just making sure this is the only use for the card. I couldn't think of anything else, but I'm not the best at reading into an ability's potential.
Edit: Ack! ...meant to post this in Rules...