Thread:SirLudXVI/@comment-37230015-20181205142507/@comment-26684750-20181205143345

Yes, all copies of the buddy are boosted, so each Many Mummy would get power+5000 for each copy of Ultimate Buddy! in the soul of buddy monsters on your field. If you have 4 copies in total, each Many Mummy would receive a power+20000 boost.

Though there are not as many Danger World cards that fit in with Mummies, and generate hand advantage, they include: Armorknight Cougar "A" Amassed Spinning Aura Burst Deity Calling Ritual Immense Pressure (with a little help) Members Only Club, Deadeity