It can also be used as a resource management system where a Pokemon will be knocked out, and you want to make use of its Energy elsewhere before it goes
adds an element of unpredictability, creating opportunities for explosive plays
If you don't dabble in cards, the game suggests, then you might as well take yourself to the edge of the island and throw yourself in the sea - that's how serious it all is
Yuriko is a prime example of this, able to come down for just two mana if you get through with just one creature in combat
Among main decks of Izzet Prowess builds specifically, 6 players are running four copies, 75 are running three copies, 32 are running two copies, 8 are running one copy, and 19 are running no copies of Vivi Ornitier
Incapsula incident ID: 1848000720969293555-1338759332262056508