The two auctions, hosted by PWCC Marketplace, contain every card in their respective set graded at a PSA Gem Mint 10
Its only effect is to "celebrate" an opponent and then proceeds to list some examples, to represent the theme of appreciation for one's companionship that often permeates over the celebrations
Ive always since Pokemon Yellow on the Game Boy been of the opinion that players should play with Pokemon they like best, not necessarily what the current meta is, so read about the theme decks see what Pokemon they contain, see which of the trainer cards would best suit your playstyle and then go and have fun!
That said, unless you are planning on opening a lot of boxes (to help even out variance), I'd probably plan on getting the non- Masterpiece value and treat the possibility of opening a super-sweet, super-expensive Invocation as a bonus lottery ticket that you get for free when buying a box of Amonkhet
Bounty cards are a special addition to COMMANDER DECKS that present players with some interesting characters to try and apprehend
