Following in the footsteps of The Brothers War, MTGs latest premier set is once again pushing the bounds of collectibility
If we want to get particularly granular about it ( Magic is most definitely all about numbers, after all), then the average instance of casting and resolving a cantrip which traditionally obtain card selection information from amongst three possible cards (see Brainstorm, Ponder, etc.) is representative of viewing roughly 5% of a traditional 60-card deck, versus 3% of the traditional Commander deck
You only get to do this two times, then it defaults to a generic 6/5 creature with trample, but you're either going to get two free spells, or you're putting pressure on your opponents to remove a potentially game-ending problem
However, if you're still curious, the average size is 24 inches by 14 inches (61.0 cm by 35.6 cm) MTG deck size An MTG deck size depends on which of the MTG formats you're playing
If Archfiend of the Dross is no longer on the battlefield as its upkeep triggered ability resolves, use the number of oil counters it had the last time it existed on the battlefield to determine whether you lose the game