We have updated the functionality of the Rogue quest reward Crystal Core in order to address some inconsistencies. This new functionality also applies to Dark Pharaoh Tekahn’s Battlecry effect.
After Crystal Core is played, the base copies of your minions will now have 4/4 stats. The stat numbers will appear as white, instead of the green text indicating a buff. This means that if your opponent steals or silences your minion, it will remain as a 4/4.
Additionally, minions currently in play will receive a onetime effect that sets their stats to 4/4, overriding current enchantments and clearing damage.
Some interactions will change under this new functionality. Cards that create a copy of a minion with specifically stated stats (Sonya Shadowdancer, Prince Taldaram, Barnes, etc) will now work as written on the card text. For example, the minion summoned by Barnes will be a 1/1, instead of a 4/4.
So if I understand correctly Sonya will give 1 mana 1/1 copy not 1 mana 4/4 copy.
This was the nerf we needed when Quest was still in standard, it sees no play in Wild.