Oath of the Gatewatch is a small set with 69 commons, 60 uncommons, 42 rares, 12 mythic rares, five variations of each standard basic land, and 20 expeditions. It is collated as a set with 70 commons (the usual for a small set of this era) because there are two versions of Wastes. 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.
Oath of the Gatewatch was sold in 15 card booster packs (which contain an additional ad card). Booster boxes have 36 packs.
The US printing uses sequential collation.
Packs are back-facing and have only 10 commons followed by 3 uncommons, a rare, a basic land or checklist, and an ad card. If there is a foil, it will displace a common and appear after the rare. (This includes expeditions.)
|10 Commons||3 Uncommons||1 Rare||1 Land||1 Ad Card|
|9 Commons||3 Uncommons||1 Rare||1 Foil||1 Land||1 Ad Card|
There are four common runs: A, B, C1, and C2. Half of packs have A, B, and C1 and half have A, B, and C2. Run A has 22 distinct cards each printed three times, and B has 18 cards each printed three times. These are probably on the same sheet. Both C1 and C2 have the same set of 40 distinct cards. C1 is a 66 card run with 14 cards appearing three times and the rest appearing two times. C2 is a 54 card run with those 14 cards appearing once and the rest appearing two times.
C1 packs have 3 A cards followed by 2-3 B cards and 4-5 C cards. C2 packs have 3-4 A cards followed by 2-3 B cards and 4 C cards.
When a foil appears in a pack, it will displace a common card. Common foils displace C2 commons. Uncommon foils displace B commons. Rare foils displace C1 commons. I'm not sure yet about expeditions.
The uncommons are split into an A and B run each with 30 distinct cards appearing four times each. Packs have either two A uncommons followed by a B or one A uncommon followed by two B uncommons.
All three basic land variations from Battle for Zendikar can appear in packs (including as foils). The land sheet is apparently the same sheet used in Battle for Zendikar.
The A common run consists of 22 different cards each appearing three times. The cards alternate between white, blue, and red (ignoring devoid, with two exceptions for white cards appearing in the place of other colors). The choice of first card is mostly arbitrary.
The B common run consists of 18 different cards each appearing three times. There are cards are alternating black and green (ignoring devoid). The choice of first card is mostly arbitrary.
The C1 common run consists of 30 different cards each appearing two or three times. It includes cards of all colors and colorless cards. The choice of first card is mostly arbitrary.
The C2 common run consists of 30 different cards each appearing two or three times. It includes cards of all colors and colorless cards. The choice of first card is mostly arbitrary.
The A uncommon run consists of 30 different cards each appearing four times. The choice of first card is mostly arbitrary.
The B uncommon run also consists of 30 different cards each appearing four times. The choice of first card is mostly arbitrary.
Most of the marketing cards in Oath of the Gatewatch have a token or emblem on the front face. Some of the tokens are duplicates of Battle for Zendikar tokens including that expansion symbol, but not all Battle for Zendikar tokens appear here. Unusually, the Eldrazi Scion tokens with art from Battle for Zendikar have been reprinted with the new expansion symbol (perhaps due to the existence of new art alongside old art). In addition, there is a card that has an advertisement for Magic Duels on the front face. (The front has an ESRB rating and the back has PEGI, so I'm not aware of any region differences.) They are printed on an 11 × 11 sheet with different items appearing different numbers of times. The choice of first card is mostly arbitrary.
|Eldrazi Scion × 2||Eldrazi Scion × 2||Eldrazi Scion × 2|
|Octopus × 2||Angel × 4||Elemental × 7|
|Kor Ally × 8||Magic Duels Ad Card × 8||Elemental × 9|
|Plant × 9||Knight Ally × 12||Eldrazi Scion × 13|
|Eldrazi Scion × 13||Eldrazi Scion × 13||Zombie × 17|
There is a picture of the foil common sheet available.  Each common card and basic land variation appear once. The extra copies of Swamp are presumed to be fillers.
There is a picture of the foil uncommon sheet available.  Each uncommon card appears twice. The extra copy of Reckless Bushwhacker is presumed to be a filler.
There was a picture of the foil rare sheet available.  Each rare card appears twice, and each mythic rare card appears once. The extra copies of Captain's Claws are presumed to be fillers.
 A picture of the foil US common sheet was posted in the Misprints facebook group by Roberto Esposito.
 A picture of the foil US uncommon sheet is available from Desert Bus 2017.
 A picture of the foil US rare sheet was available in the collection of Casey Petrillo. (This collection is no longer publicly accessible.)