There are 10 rares in non-foil (11.1%) and silver foil (11.1%), and there are 5 mythic rares in non-foil (2.8%) and silver foil (2.7%)
Even a 1/1 will simply double itself, due to rounding up each time
Where the set really shines are the two brand new mechanics Start your engines
Today, well be looking at five cards to keep an eye on for Standard
If you need to counter a planeswalker or another non-creature spell, it's clearly better than Izzet Charm since it only costs one mana, but if your opponent is drawing cards with a Dark Confidant or has so much mana they can easily pay two extra for their spell, it's stuck rotting in your hand
Limited-time events, such as tournaments or leaderboard races, can keep things lively, provided that rules and prize distribution are communicated clearly