No one is quite sure how that happened, but you could get a 3/3 for three mana with a minimal drawback and the ability to hide from removal
It copies all triggered abilities of the chosen creature type, not just ETBs, which opens up so many more interactions than the average Panharmonicon effect
Sokka can attack without tapping, which allows it to also block next turn, and as long as it doesn't attack alone, you can also draw a card
Others, such as Dragon Star or Card Labo, also provide extensive table setups for players to duel with others, and often host their own tournaments and events to encourage players to meet and play
Without a bench barrier ability to stop it, G-Max Rapid Flow can damage anything on the board at will