In a deck like Mizzix of the Izmagnus, you can casually draw 30+ cards off a Blue Sun's Zenith and use Fateful Showdown to finish off an opponent
Most players who are in the middle of games won't have their binders out, so it never hurts to ask them the question
The result is two numbers, because they answer two different questions: the ceiling (can win as early as turn X your best 5% of draws) and the typical hand (the average hand wins around turn Y the median)
The card reads: Whenever an opponent casts a spell, you may draw a card unless that player pays one mana. This leads to a lot of extra cards, but it results in whoever plays it having to constantly ask if people will be paying one mana to stop them from drawing a card
This is especially so because the other such card was a Pok Ballits exceptionally rare that item cards end up becoming highly sought-after
The number beside a move is the damage that will be deducted to the HP of the opposing Active Pokemon