From the Wizard101 website:

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Life Deckathalon Event!

"Liven up your day! Now through Monday, November 20th, battle your way through the Life Deckathalon Tower to test your TC-slinging skills, rise up the leaderboard ranks, and win exclusive prizes like the Life Class Pet! Learn More »"

See the complete Event Announcement here.

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See additional information here: Basic:Life Deckathalon.