Those are not cooldowns, that is you restoring energy! If you look at the top right, you will see a number of dots, and that is how much the cards cost. If you don't have enough energy, you have to wait until you do. Hence the restore energy card.
oh that makes a lot more sense. i understood how energy works, i just thought there was also a cooldown mechanic happening.
seems like it would be better to just have that radial energy restoration display over your energy tracker, rather than on each individual card. as it exists now, it's a very confusing ui