Journey Into Nyx is a small set with 60 commons, 60 uncommons, 35 rares, and 10 mythic rares. This is the normal size for a small set of this era. Foil cards are included in booster packs with advertised odds of 1 : 67 cards. The set was printed in English in the USA and Belgium.
Journey Into Nyx was sold in 15 card booster packs (which contain an additional ad card). Booster boxes have 36 packs.
There is a small chance for a pack of Journey Into Nyx to be a "god pack" containing all 15 god cards from the block (with their original expansion symbols) instead of the usual contents.
The US printing uses sequential collation.
Packs are back-facing and have 10 commons followed by 3 uncommons, a rare, a basic land (from Theros), and an ad card. If there is a foil card, it will appear after the rare, displacing a common.
|10 Commons||3 Uncommons||1 Rare||1 Land||1 Ad Card|
|9 Commons||3 Uncommons||1 Rare||1 Foil||1 Land||1 Ad Card|
The commons are printed on one sheet with each card appearing twice (and one filler). This is divided into a 66-card A run (with 33 distinct cards) and a 54-card B run (with 27 distinct cards). Discounting foils, packs contain 5-6 A cards followed by 4-5 B cards.
When a foil appears in a pack, it will displace a B common card. This can happen both in packs with 4 B commons (resulting in 3 remaining) and in packs with 5 B commons. The foil rare sheet has 3 copies of each rare and one copy of each mythic rare which violates the normal 1/8 mythic rate.
Uncommons are printed on one sheet with each card appearing twice (and one filler). This is divided into a 66-card A run (with 33 distinct cards) and a 54-card B run (with 27 distinct cards). Packs can have either 2 A cards followed by 1 B card, or 1 A card followed by 2 B cards. Since the runs are unbalanced, 2 A cards should mathematically happen 13/20 of the time.
God packs (or at least the one that was recorded) contain, in the following order, Iroas, God of Victory, Kruphix, God of Horizons, Athreos, God of Passage, Keranos, God of Storms, Pharika, God of Affliction, Xenagos, God of Revels, Ephara, God of the Polis, Mogis, God of Slaughter, Karametra, God of Harvests, Phenax, God of Deception, Nylea, God of the Hunt, Purphoros, God of the Forge, Erebos, God of the Dead, Thassa, God of the Sea, and Heliod, God of the Sun. There is also an ad card at the end, as usual.
The A common run consists of 33 different cards each appearing twice. The choice of first card is mostly arbitrary.
The B common run consists of 27 different cards each appearing twice. The choice of first card is mostly arbitrary.
The A uncommon run consists of 33 different cards each appearing twice. The choice of first card is mostly arbitrary.
The B uncommon run also consists of 27 different cards each appearing twice. The choice of first card is mostly arbitrary.
The marketing cards in Journey Into Nyx have a token or tip on the front face. They are printed on an 11 × 11 sheet with different items appearing different numbers of times. The choice of first card is mostly arbitrary. Note that some of the tokens have the Theros or Born of the Gods expansion symbol, but not all of the tokens from those sets appear here.
|Zombie × 2||Gold × 3||Hydra × 3|
|Snake × 3||Satyr × 4||Soldier × 4|
|Ajani Tip Card × 5||Bestow Tip Card × 5||Constellation Tip Card × 5|
|Devotion Tip Card × 5||Expansion Symbol Tip Card × 5||Heroic Tip Card × 5|
|Inspired Tip Card × 5||Monstrosity Tip Card × 5||Nyxborn Tip Card × 5|
|Proportions Tip Card × 5||Sphinx × 5||Strive Tip Card × 5|
|Xenagos Tip Card × 5||Spider × 7||Bird × 15|
|Minotaur × 15|
There is a picture of the foil common sheet available.  Each common card appears twice. The copy of Temple of Malady is presumed to be a filler.
There is a picture of the foil uncommon sheet available.  Each uncommon card appears twice. The copy of Temple of Malady is presumed to be a filler.
There is a picture of the foil common sheet available.  Each rare card appears three times and each mythic rare appears once. The extra copies of Temple of Malady are presumed to be fillers.
 The common runs for US Journey Into Nyx were originally posted by AntiC7 on the MTG Salvation forums. (However, this post is no longer available, probably as part of a wider purge of content in an attempt to comply with privacy laws.)
 A picture of the foil US common sheet was posted in the Misprints facebook group by Casey Petrillo.
 Pictures of the foil US uncommon and rare sheets were posted in the High Rollers facebook group by Albert J. Yeh.