Ikoria Sultai Brokkos for Commander

Its great to case this commander from the graveyard with Mutte, but it's otherwise a 6/6 5 CMC Trample creature. It's all in on Mutate since all three colors have four mno-color Mutate creatures each and three multi-colored Mutate creatures. This means it's a 'no Humans' deck. The Ultimatum is cool, but definitely not game-ending. It has the beauty of Gifts Ungiven, of course, and that is always fun. The enchantment is awfully specific and is good for feeding the graveyard.

This will likely be the commander I spend the most time playing. It's in the colors of Muldrotha!!

This deck is all-in when it comes to the graveyard. As such, it uses many of the cards Abzan is using.

Here are the uncommon and rare Mutate cards. The black rare (Dirge Bat) is, in my opinion, the best of the batch. I am not sure I care for Deathtouch and Mutate together since all you need for Deathtouch is a lowly 1/1 critter.

Just as with Abzan, you need to protect your graveyard.

The Mythos for this wedge allows you to tutor into your graveyard. I would do it late game and guarantee that I reanimate at the same time I play this card.

Here are some big critters currently in Standard for the Brokos piles.

These caught my eye for this deck. I wish there was more Flash to use Cunning Nightbonder with. It's just one card and gets diluted in Commander. It's a much better Constructed card.

I am convinced Ikoria makes Theros II way better, and that's great news for our poor Theros II set. Escape is at home in this deck.

Ikoria Jeskai Vadrok for Commander

This is yet another Mutate commander in Ikoria. It's Ultimatum is really good but does not read game-ending. It's enchantment is a great card-drawing engine. The clause on Vadrok is about non-creature spells, and that is MUCH better than just instants and sorceries with Theros II having enchantments (even though, poor Theros II lacks the awesome enchantments found in Ikoria). 

I am not sure if I want to be on Humans in this deck given all the fun Mutate creatures that go well with Vadrok. Maybe there are two completely different builds that work well; one on Humans, the other not.

There are some great Death and Taxes cards in Ikoria and perhaps Theros II, and I want them all in this deck. Drannith Magistrate looks like could be a great card, period.

After the Death and Taxes crew is in, I want this deck to be mostly on Flyers for creatures.

The Mythos for this wedge is versatile, but it does not hit players.

Here is a run of non-creature spells currently in Standard I want to play in this deck.

Ikoria Mardu Snapdax for Commander

This is yet another Mutate commander in Ikoria. It's Ultimatum is amazing. It's enchantment is all right.

Ikoria has some solid Menace support for this deck. Mardu is all about combat.

Ikoria has a strong Humans component, and also a Human friends component, with the minor caveat that Mutate creatures cannot interact with Humans.

Cycling works well with the Human theme in Ikoria.

And since Cycling drops cards in your graveyard, it will not hurt to have cards that profit from what you drop in your grveyard.

There are also some cool Red exile cards in Ikoria. This theme is all about temporary exile and casting from exile.

The Mythos for this wedge is a Balance-type of card.

Kumoros, like most of Theros II, is the card that could have been great. It fits a very narrow deck in these colors. "Players can't case spells from graveyards" is a great clause in every other possible card but this one. Theros II, what were you thinking????! The devotion set without devotion, and the graveyard set with neutered graveyard interactions. It's great for a set to be so well-balanced that it has no broken cards. It is also true that a well-balanced set can balance itself out of fun, and Theros II succeeds brilliantly in this department.

Ikoria Abzan Nethroi for Commander

This is one of the Mutate commanders in Ikoria. It's a fantastic reanimation engine. It's Ultimatum should be a game-ender. It's enchantment has multiple ways to help you, including life gain in case your black cards cost you too much life.

This deck needs to drop lots of card into the graveyard and has a solid Companion in Kaheera. I would add several reanimation spells in the vein of Cauldron's Gift.

The flyers are mostly going to be White and Black.

Green helps to feed the graveyard.

Ikoria also has some new graveyard feeder spells.

Here are some great cards for this deck in the current Standard.

You will need to protect your graveyard.

The Mythos card for this wedge is reasonably powerful since it can destroy a nonland permanent (and not just a creature as Murder would).

There are other cards in Aban or that can be added to Abzan, but I don't think these fit what this deck is doing.