disconaut has to die asap after he hits the board. thats pretty clear.
on supertricks......I don´t know. I like to keep them because you don´t give away information right away. For example; People will play very differently against a green shadow player that has a super in hand (even though they don´t know which one) than against one that has fired away her super. With green Shadow you can also bait people to play their important drops into middle lane to crunch them there.
Especially when playing against decks that have a very important signature card while playing a hero that has strong removal supers......thats just a strong mindgame.
Rose excells that this. you have transmorg, goatify and weed whack. people will seriously think twice to play their key card against you if you still have your starting power in hand because it can utterly destroy their deck-tech