Ixalan Collation

Ixalan is a large set with 101 commons, 80 uncommons, 53 rares, 15 mythic rares, four variations of each standard basic land, and 10 double-faced cards. Not counting the double-faced cards, this is the normal size for a large 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.

Ixalan was sold in 15 card booster packs (which contain an additional ad card). Booster boxes have 36 packs.

US Pack Anatomy

The US printing uses sequential collation with C1/C2 common collation.

Packs are back-facing and have 10 commons followed by 3 uncommons, a rare, a basic land or checklist, and an ad card. If a double-faced card appears, it replaces the rare. If there is a foil card, it will appear after the rare, or if there is a double-faced card, the foil will appear before the double-faced card. The foil displaces a common. If there is a double-faced card (including foils), there will always be a checklist in the same pack, but checklists can also appear in other packs.

Packs are evenly split between C1 commons and C2 commons. C1 packs have 2-3 A cards, 2 B, and 4-5 C. C2 packs have 4 A cards, 2 or 4 B, and 2 or 4 C.

When a foil appears in a pack, it will displace a common card. Common foils displace A commons and only appear in C1 packs. Uncommon foils displace B commons. Rare and double-faced foils displace C2 commons. Common foils appear 1 in every 8 packs. (This seems to be true even though there are additional double-faced cards as those seem to eat into the rare rate.) The uncommon and rare rates are not known exactly.

As normal, uncommons are split into equal A and B runs with one or two A cards and one or two B cards appearing in each pack.

It is hard to determine the exact rate for double-faced cards from collation patterns, but Mark Rosewater has stated that they have the exact same rarity as other rares (meaning each rare is 2/141 and each mythic is 1/141). [1] This is plausible.

Basic lands and checklists appear to be printed on different sheets. The rate of checklist appearance is hard to pin down, but besides the checklists that occur with double-faced cards, it is probably between 1/32 and 2/32. (Here, the 32 includes packs with double-faced cards.)

Common Runs

The A common run consists of 33 different cards each appearing twice. The cards are alternating white, black, and red. The choice of first card is mostly arbitrary.

The B common run consists of 22 different cards each appearing three times. The cards are alternating blue and green. The choice of first card is mostly arbitrary.

The C1 common run consists of 27 different cards each appearing twice plus Ritual of Rejuvenation, the short-printed common. It contains cards of all colors and colorless cards. The choice of first card is mostly arbitrary.

The C2 common run consists of 18 different cards each appearing three times plus Ritual of Rejuvenation, the short-printed common. It contains cards of all colors and colorless cards. The choice of first card is mostly arbitrary.

Uncommon Runs

The A uncommon run consists of 40 different cards each appearing three times. The choice of first card is mostly arbitrary.

The B uncommon run also consists of 40 different cards each appearing three times. The choice of first card is mostly arbitrary.

Token Run

All of the marketing cards in Ixalan have a token 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.

Token Rarity
Illusion × 4	Plant × 4	Pirate × 8
Merfolk × 9	Dinosaur × 12	Treasure × 15
Treasure × 15	Treasure × 15	Treasure × 15
Vampire × 24

Foil Common Sheet

There is a picture of the foil common sheet available. [2] Each common and land variation appears once.

Foil Uncommon Sheet

There is a picture of the foil uncommon sheet available. [2] There is probably a second complementary so that each card appears three times between the two sheets. The sequence is expected to repeat.

Foil Rare Sheet

There is a picture of the foil rare sheet available. [2] Each rare card appears twice, and each mythic rare card appears once.

[1] Mark Rosewater discusses the rarity of Ixalan's double-faced cards in this Blogatog post.

[2] All three US foil sheets were given away during Desert Bus for Hope 2017. I can't find any good image sources that are still online for the common sheet. The uncommon sheet is here and the rare sheet is in this video.