Themes:

Azorius (W/U): Historic (artifacts, legendaries and sagas)

Orzhov (W/B): Reanimator

Dimir (U/B): Self discard

Izzet (U/R): Spells matters

Rakdos (B/R): Sacrifice

Golgari (B/G): Self mill

Gruul (R/G): Storm

Boros (W/R): Modular (Auras, equipment, vehicles)

Simic (U/G): +1/+1 counters