If I open a pack, and it contains a foil, this foil could be any card in the set, from basic lands to the most expensive mythic rare. My question is, does each individual foil card have the same chance of being opened? Or does it follow the same distribution as boosters follow?
To illustrate, if you were to open boosters until you got 14 foils, would those foils be in a distribution equivalent to the number of commons/uncommons/rares in the set? Or would those 14 foils be in the distribution equivalent of a booster (e.g. 10 commons, 3 uncommons, 1 rare)?
Crucially, can you supply evidence to support this?