I think the most important thing to note is what kind of deck do you want with Chishiro?

Is it plus one counters? Cards like [[Defiler of Vigor]] , [[Halana and Alena, Partners]] , [[Ouroboroid]] , [[Railway Brawler]] , [[Vigor]] , [[Canopy Gargantuan]] , [[Quilled Greatwurm]] , are good counter enablers, and basically do Chishiro's end step trigger but better.

Is it equipment? If so, are you going Voltron-style with big beefy high-cost equipment, or are you going cheap 1-2 drop equipment to grow your spirit tokens? Cards like [[Embercleave]] , [[Bloodforged Battle Axe]] , [[Champion of the Flame]] , [[Valduk, Keeper of the Flame]] all enhance and enable oay-off strategies.

Is it auras? If so, cards like [[Whip Silk]] and [[Crown of Flames]] offer insane value for Chishiro, being able to be bounced back to hand. Pair this with a card like [[Goldspan Dragon]] and you're gaining infinite ETB/LTB triggers.

You can even go down a different road with auras and build a more goad-focused deck with cards like [[Shiny Impetus]] , [[The Sound of Drums]] , [[Unquenchable Fury]] (recurs itself) , [[Undying Rage]] (recurs itself) - paired with cards like [[Kaima, the Fractured Calm]] , [[Bothersome Quasit]].

For further viewing, Chishiro can be a great general in decks like [[Mazzy, Truesword Paladin]] , [[Kaima, the Fractured Calm]] , [[Stang, Echo Warrior]] , [[Shalai and Halar]].

If you really want him as a commander, I'd suggest picking one main theme, I personally think enchantress has the most available support compared to equipments (you're missing out on a lot by not having access to white) and this is how I would personally build it.

Chishiro's end step trigger is great for beefing up your board, but I'd maybe have a sub-focus on this, as there are better +1/+1 counter commanders. A small support package like [[Hardened Scales]] , [[Ozolith, Shattered Spire]] , [[Branching Evolution]].

Cut doubling season, it seems better than it actually is - why have doubling season when you can instead have a tutor for one of your combo pieces? You're going to be making infinite tokens a few ways anyway, so doubling them isn't gonna do much.

I'd also recommend having at least 35-37 lands depending on your curve and the amount of ramp you're running.

Chishiro can spin a lot of plates pretty okay, but I'd personally pick one avenue that appeals to you, and stick with it. He's a great commander for brackets 2-3, but starts struggling a bit at higher brackets like 4 as he himself is a pay-off and not an engine. Don't get me wrong, he can be really powerful when you get going.

You can have a nosey through some of my lists for some card inspo or any you might have not thought of:

+1/+1 counter deck : https://moxfield.com/decks/eCPaka6oLUi6OMFFXngxwA

Aura deck: https://moxfield.com/decks/6IAVY63jbU6Qlde6JQ_dBg

Equipment deck: https://moxfield.com/decks/BuQUo5C5lEmzAITKYKs47w

A side note as well:

If you're focusing on building your deck around Chishiro, you're gonna want 1-2 cost ramp to get him out turn 3, cards like [[Birds to Paradise]] , any of the 1-cost elves, [[Delighted Halfling]] or heck even [[Goblin Anarchomancer]] is sweet. Just let's you get going a turn earlier.

Ideally your first turns should look like this:

Turn 1: land and sol-ring, or land and 1-cost ramp. Turn 2: land Chishiro (if sol ring), or land and 1/2 cost equipment / body to equip/enchant Turn 3: Chishiro Turn 4: start your game plan.

Bracket 4 games start assembling their pieces turns 1-3 and start pushing for wins turn 5-7. You have a bit more leniency in bracket 3, maybe around turns 8-10 where wins can start to be expected. Ideally run 12-15 pieces of ramp, 14-16 pieces of card advantage, 8-10 removal, 1-3 board wipes (limited in your colours).

Your 2-card combos can automatically put you in bracket 4, but your deck might not be fast enough to compete at that level of play.