On May 26-28, players can head to their local game store for March of the Machine Commander Parties.
The special objective for this Commander Party will involve saving the planes of Arcavios, Eldraine, Kaladesh, Kaldheim, Kamigawa, New Capenna, and Theros. Each plane will have two unique cards with different effects. These represent when the plane is under attack (besieged) and when it is safe (victorious). You must meet the conditions of the besieged side in order to earn the bonus from the victorious side. You can view each of these cards below.
The best part of the Commander Party, is that each participant will earn a Phyrexian-language Beast Within promo card. Those attending multiple events can earn additional Beast Within promos.
Read the original article from Wizards of the Coast.