You see, if you cast a spell that sets up an effect that happens "at end of turn" once you've past the start of the end-of-turn step, you can keep the results of that spell around until the next end-of-turn step
Do not use counterfeit cards: Not every card is valuable
But these counters also represent Domris toughness, so if your opponent attacks Domri and the card suffers damage, you lose one counter for every point of damage sustained
Overall, it's a much more versatile batch of cards than this grab-bag of Hatsune Miku planeswalkers - some are good in Commander, but you also have the Modern card Living End, as well Careful Study, which sees a little bit of Legacy and Pauper play
You can replay these games over and over too, which is particularly helpful if you're a hardcore player looking to test a new deck against AI opponents before using it against real people