The supplied video description lists a new Electro Wizard Hero and a new Electro Giant Evolution for Clash Royale. It does not give their abilities, requirements, or release timing.
Before changing your deck around either card, look for a fuller announcement with those details.
Free Clash Royale Codes
Current active codes and how to redeem them.
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Player Comments
94 players commented on this guide.
This guide answered the exact question I had.
This saved me time in the early game.
I tried this today and it worked better than my old setup.
This helped me understand heroes much better.