If multiple creatures enter the battlefield simultaneously, you must still choose different modes for each instance of the triggered ability that's put onto the stack
The inability to make mana for things like Nissas Pilgrimage, From Beyond, Nissas Renewal, Ugin, the Spirit Dragon and basically any plain ol spell restricts you to a very creature-heavy build
Naturally, you can use the old-school method of pen and paper to remember how many wins each player had and just pair the winners
For a modern MTG set, color-frame errors like this are really rare and super fun to stumble upon
Out of the two actual set editors and the honorable mention that I cant bring myself to exclude, which do you prefer
Etsy is also a fantastic spot to find custom sleeves as gifts