A cube to honor the greatest of all Magic planes, Theros.
Supported archetypes:
WU - heroic fliers
UB - mill control
BR - minotaur typal
RG - griefer stompy
GW - +1/+1 counter heroic
WB - enchantment bleed
UR - instants and flash
BG - self-mill / escape
RW - go-wide heroic
GU - ramp into monsters
Green may need more graveyard payoffs.
Blue-green may need more big guys to ramp into.
Green needs a 6-drop?!
Is blue-black mill actually viable?
Can red-green have a more coherent identity?
Are the red creatures aggressive enough?
Is every god name-dropped at least once in a card's title, art, or flavor text?