To enter the event this month, you need to buy 3 or more packs of Maximum Crisis.

Players receive 2 of 6 different Clear Card Cases.

This month is:

A) Yuya & Odd-Eyes Raging Dragon

B) Yuto & Dark Requiem Xyz Dragon

C) Yugo & Crystal Wing Synchro Dragon

D) Yuri & Greedy Venom Fusion Dragon

G) Kurosaki Shun & Raidraptor – Ultimate Falcon

H) Edo Phoenix & Destiny HERO – Dystopia

Source