PrinceMamemon - BT13-074 - Uncommon from BT-13 Booster Set: Versus Royal Knights, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: sasasi
• Card Text:
  [On Play] [When Digivolving] Reveal the top 3 cards of your deck. You may play 1 Digimon card that has [Mamemon] in its name and a play cost of 10 or less among them without paying the cost. Trash the rest.
  [All Turns] All of your Digimon with [Mamemon] in their names or the [Royal Knight] trait gain [Jamming] and [Reboot].