archetypes:
artifacts (WUBR or WUB) b
cascade (UBRG or URG) u
landfall (WURG or WRG) w
+1/+1 counters (WUBG or UBG) g
human tribal (WBRG or WBR) r
sacrifice (BG)
lifegain (BW)
equipment (RW)
tokens (UG)
spellslinger (UR)

3 commanders for each archetype, plus 3 WUBRG commanders for goodstuff or a spare commander if needed

horde of notions has the ability <choose 5 creatures in your deck before shuffling. they gain the creature type "elemental">
Horde of notions also has the ability <,, Discard a card: Draw a card. Activate only as a sorcery.>

distribution of generic cards:
55 lands
50 ramp: 3 for each colour except green has 9, 28 colourless ramp
8 board wipes - 1 colourless, 2 white, 1 blue, 1 black, 2 red, 1 green
8 tutors - 3 black, 1 colourless, 1 red, 1 green, 1 blue, 1 white
29 card draw - 5 red; 4 green; 4 white; 7 blue; 7 black; 2 colourless
36 removal - 10 white; 6 blue; 6 red; 9 black; 4 green; 1 colourless
6 graveyard recursion - 1 for each colour except green has two
8 draft help
2 counterspells cause why not

nascent metamorph, infinity elemental cause i like them

the rest work with one or more commanders

"partner with" commanders count as 1 card

build a 60-card commander deck with 4 packs of 15 cards

https://cubecobra.com/cube/list/ccc360 im using to help
http://www.listdiff.com/compare-2-lists-difference-tool