By logging in from the start of the campaign, until December 5th, 12:59 (JST), you can obtain 1 Crimson Powerforce Structure Deck. Or, if you already have purchased it, you get 500 gems instead.

16 Secret Packs containing the themes used for the Nijisanji festival will be unlocked for the duration of the campaign, and you can obtain 1 free pack (from how many of them, not specified)

The Secret Packs are:

Darkest Magics

Essence of Flora and Ocean

Dragon Luster

VS NEW CHALLENGER!

Transfigured Heroes

Justice from Light

The Ultimate Traditional Art

New World Replete With Joy

Pearlescent Cyber Dragons

Fiendish Encounter

Sisters of the Light

Illusion Beast’s Roar

Savage Crimson Dragon

Singular Strike Overthrow

A Dance Dedicated to the Heavens

In order to participate in the token campaign, you have to clear a mission(s) in Master Duel, and use Duelist Points from the point system (only available to Japan at this moment) to enter a raffle to obtain the token(s). This campaign will run until November 30th, 13:59 JST.

Source.