As you can see at 1:08 of video, Delay talent is triggered by Toth-Amun minion. But next time minion hits it’s vanished.
According to the description the skill should work for 2 turns starting next turn from activation.
Maybe it is the minion, who somehows clears the skill prematurely, or it is just bugged, but this skill also appears extremely rarely, absolutely not 3%:
I tried to trigger this skill by tiles - and there was no success by more then 20 battles. And it’s first time skill activates by minion despite almost every attempt I summon 2-3 minions letting them finish opponents by 20+ hits.