Blizzard just released the details for the latest patch, and it includes some Standard format changes, alongside some major nerfs to Wild format cards, and some crazy big changes to Duels.
Patch Notes: https://hearthstone.blizzard.com/en-us/news/23921492/25-4-3-patch-notes
Timestamps
0:00 Standard
3:12 Wild
7:02 Duels
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News | Hearthstone | NERFS & BUFFS!! Wild cards murdered! Crazy Duels changes!