War of the Spark, Phyrexia: All Will Be One, and March of the Machine combined into one set, plus a few other cards (NEO sagas, planeswalker deck planeswalkers, and some others)

Each pack has
1 Planeswalker
1 Battle/Saga
4 Uncommon
8 Common
1 Land

With a 25% chance of replacing a Common with an additional Land. In Draftmancer, disable replacement and add 2x of each land and common.

For an 8-person draft, each card will be seen an average of:
Planeswalker, Battle/Saga: 0.8
Uncommon: 0.77
Common: 1.52
Land: 1.36
Given the counts of 30, 30, 124, 122, 22 respectively.

All poison cards were removed, as well as the Knight synergies.

WU: Artifacts
UB: Amass
BR: Sacrifice
RG: Battles, Power 4+
WG: +1/+1 counters
WB: Phyrexians
UR: Noncreature spells, Convoke
GB: Incubate
WR: Equipment, Backup
UG: DFCs

Also basically everything combos with Proliferate to boost Planeswalkers, get more +1/+1 and oil counters, and to make enemy Battles harder to flip.