Despite being relatively new to competitive Pokmon, Im no stranger to playing card games at a high level, having played competitive Magic for the past 12 years, including a Pro Tour appearance (their equivalent of an invite-only IC)
In essence, you can view the metagame as follows: 9 Alrund's Epiphany decks (Izzet Epiphany, Grixis Epiphany, and Izzet Dragons) 4 Esika's Chariot decks (Mono-Green Aggro and Temur Treasures) 3 Luminarch Aspirant decks (Mono-White Aggro and Azorius Tempo) Given the Standard metagame developments over the last few weeks, as detailed in the article by analyst Mani Davoudi, a field of Epiphany, Chariot, and Aspirant decks does not come as a big surprise
For example, if Elite Arcanist's enters-the-battlefield ability is copied, two cards are exiled
When it enters the battlefield, each player votes for "strength" or for "numbers"