Challenge Card: Hyper Mega-Mecha Seagull x9000

Challenge Card: Hyper Mega-Mecha Seagull x9000 is a Challenge Card that summons Hyper Mega-Mecha Seagull x9000 to fight in the Bizmo's Brawlpub or  Brawl'gar Arena.

Source
The item can be bought for from:
 * Card Trader Leila in Bizmo's Brawlpub
 * Card Trader Ami in Brawl'gar Arena