Does the Rogue Crystal Core mechanic affect played AND summoned minions? Are Jades affected? "Yes, both played and summoned. Also Frogs and Sheep. Pretty much everything gets turned into a 5/5." - Peter Whalem.
Crystal Core- does it make your minions 5/5 forever, i.e heal back up to 5 every time they take damage? "No, only when you play the reward or the minion is summoned. Not every turn - you can buff them after." - Peter Whalem.
What about before/after battlecries? Will an Edwin always be 5/5 or can you get him to 7/7, 9/9, etc? "If Edwin's in your hand/deck when you play the quest reward, he'll be 5/5 + 2/2 per card. If he's on the board, he'll be 5/5." - Peter Whalem.
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With the cards that have been released so far and with the knowledge of how standard might look in JTU this card isn't looking so good. It's looking downright bad because rogue has been knowing to kill with its miracle variant through either spells, through large face damage, a mixture of the two, and mill. As the class currently stands this card seems very weak without heavy support for it. We need token generation, bounce mechanics, and a way to win that doesn't involve minions with more than 5/5 in stats. Maybe charge could work but this is going into a mid to early late game win condition that if you're not controlling the board you might be dead in the water. This card seems interesting but without more heavy support it looks dead on arrival.
*Edit* Maybe something where you control the board or at least fight for it while whittling down the opponents hp so you can get to a point where the quest spell is played you have a bunch of low cost chargers that become 5/5s for a burst at the end and maybe if you have enough bounce you can actually OTK but this is best case scenario at the moment without the rest of the expansion being shown.*
I totally forgot about return to hand stuff. Well, filling out the deck with cheap minions with battlecrys and some return to hand spells and minions it can be ok. 3 minions would have been ok, 4 can be a bit tough to pull. While the opponent is smacking your face, you're having fun with RETURNING minions to hand.