The Proliferate Cube idea came from my first love in limited MTG—War of the Spark. I enjoyed the +1/+1 counter and proliferate strategies, as well as the high number of planeswalkers. This cube aims to support diverse and engaging proliferation strategies.

Archetypes
Many archetypes overlap across color pairs, and splashing is encouraged. Parentheses indicate minor support in those colors.

The most supported strategies:
(): Proliferate
(): +1/+1 counters
(): Enchantments, Sagas.
(): Energy
(): Artifacts

Some other general themes:
(): Control
(): Aggro
(): Poison counters
(): Superfriends (every color pair has at least one planeswalker, 3x monocolor, 2x colorless)
(): Ramp
(): Reanimate
: Noncreature spells tempo
(): Counter removal

Breakdown

(): Proliferate

To be finished..