Just about every MTG set has a red sorcery that does one damage to each creature an opponent (or every opponent) controls - with an equipped Ghyrson on the board, that becomes a one-sided board sweeper (indestructible creatures, and creatures with protection from red or blue not withstanding)
The cards found in these promos often have their value due to their printings and their exclusivity
Any time a creature does come into play under your control, you get to either add three green mana, put a +1/+1 counter on each creature you control, or scry two and then draw a card
On top of that, there is a regular non-Ex shiny Gengar card in Celestial Guardians that shares the same problem
All my friends will buy from this shop
This is the biggest element of confusion when dealing with Machamp because it defies all known logic about Unlimited Edition