From the Wizard101 social media sites and website:

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Fire Deckathalon Event!

"Get fired up! Now through Monday, September 18th, battle your way through the Fire Deckathalon tower to test your TC-slinging skills, rise up the leaderboard ranks, and win exclusive prizes like the Fire Class Pet! Learn More »"

See the complete Event Announcement here:

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See additional information here: Basic:Fire Deckathalon