Ten Color Challenge
One deck for each of the three-color pairs. Themes are
Bant turbofog
Esper superfriends
Grixis pirates/sea tribal
Jund critters (squirrels, spiders, rats, bears)
Naya fatties
Abzan elves
Jeskai spellslinger/tokens
Sultai counters/thievery
Mardu politics
Temur elementals