Hearthpwn

 If You Don't Know About "The PURIFIER" card, then i suggest you watch on youtube (The Purity of the Cards) video, that will give an image of the card, but if you're not interested on watching, then the card is a: 3 Mana, 1/1 Legendary (I guess it's for Priest only), with the Battlecry: If You're opponent has 5 "SILENCED" minions and You play "PURIFY" on this minion, YOU WIN THE GAME. So I Have 2 Questions  about it: 1) Would it be a Bad or Good idea to put this kind of card to HS? 2) If you would like to make this card more balanced or playable, what would you change? Note: Priest is not the best class on Ladder and particulary in Arena, but it's a class that just needs that one good card to make this class almost tier 1 (Example: Call of the Wild, Tunnel Trogg, Fiery War Axe, etc.). So im curious to see what you think about this.. ;D

Extremely bad.
There is no way to make that kind of interaction work in this game. Also it's not convenient to make wins at some kind of "distance" where you only need to satisfy a given condition.

Um Mass Dispel X2 and Silence X2 maybe some spell breakers All the control and heal cards to live. Zoo legit loses at 5 minions, unless they play around it and always keep only 4 minions. It would just be a card where you play against priest thuss don't play 5 minions or you lose. Horrible card

Not even a way to make it good idea as having a I win off condition makes the game a bit to much to play around. It is just a bit to controlling as you would have to play yourself to never play into it or you legit lose. There is the Clockwork, molten, and sea giant which are all card you have to play around, but you don't lose with those cards.