The Updated Decklist

Bringing in the new and what a change. New rules introduced, and a complete overhaul of the cube.
Now we're in Mardu colors, with a focus on cross-play. Here are the archetypes:

Legion: Modular, Outlast, Soldier Tribal, +1/+1 Tribal, Bolster, Lifelink, Lifegain

Control: Counterspells, Hatebears, Protection, Damage Negation, Resource Denial, Tap.

Aristocrats: Aristocrats, Sacrifice, Recur from Graveyard, Graveyard Matters, Self-Recurring Creatures.

Discard: Discard, Madness, Return from Graveyard, Gunk Slug, Hand Denial.

Combat: On-attack Triggers, Dash, Big Creatures.

Burn: Repeatable Burn Spells, Direct Damage, Cast from Graveyard.

Other Neat Cards: There are a few build-around-me cards that I think justify inclusion through their own ability to form deck-lists.

160 CARDS
35 red [Combat // Burn] (4 removal)
35 black [Aristocrats // Discard] (4 removal)
35 white [Legion // Control] (4 removal)
6 rakdos (4 mechanic enablers, 2 removal)
6 orzhov (4 mechanic enablers, 2 removal)
6 boros (4 mechanic enablers, 2 removal)
2 mardu (1 removal)
16 colorless (3 Mana Rocks)
19 lands (12+ colorless sources)

In Each Color:
Main Mechanic 1: 13 of color + {2 gold mechanic enablers} [Combat //Recurring Creatures // +1/+1]
Secondary Mechanic 2: 11 of color + {2 gold mechanic enablers} [Burn // Discard // Control]
Cards Outside Mechanics: 3.
Support†: 4 in color
Special Cards: 3 in color