First edition Pokmon cards attract significant value due to their scarcity and historical importance
They do indeed look like energy cards because they were
This is a bit simplified, but here's how a store manages Magic product
Aboleth Spawn Ancient Carp Blufferfish Breaching Hippocamp Bubble Smuggler Cloud Manta Coral Eel Dandn Deepglow Skate Devouring Deep Electric Eel Eluge, the Shoreless Sea Fleet Swallower Flying Dolphin-Fish Giant Koi Island Fish Jasconius Jace's Mindseeker Kapsho Kitefins Manta Ray Mer Man Moat Piranhas Mystic Skyfish Piranha Fly Ray Fillet, Man Ray Ray Fillet, Wave Warrior School of Piranha Scrounging Skyray Shipwreck Moray Skitter Eel Sky-Eel School Skyswimmer Koi Slipstream Eel Stinging Lionfish Surge Mare Tidal Barracuda Tui and La, Moon and Ocean Vivid Flying Fish Wavebreak Hippocamp Windrider Eel Wormfang Behemoth Wormfang Manta
It basically means that everyone can put their biggest thing into play for free, and while theres always a chance that shell die before you get to take advantage of that ability, itll definitely earn you some favor
As the triggered ability resolves, first the next opponent in turn order (or, if it's an opponent's turn, the opponent whose turn it is) chooses a creature they control, then each other opponent in turn order does the same, knowing the choices made before them
