Since Alpha, cards like
Lord of Atlantis



{3}, {T}: Create a 2/2 blue Shapeshifter creature token with changeling. (It is every creature type.)
or even five type
Burakos, Party Leader

Whenever Burakos attacks, defending player loses X life and you create X Treasure tokens, where X is the number of creatures in your party.
Choose a Background (You can have a Background as a second commander.)
among others. All told, you have easily over 40 Changeling creatures and dozens more highly synergistic cards that can give you a huge start on any type, ever.
What does this mean? It means that one, uniform, stack of cards is a Bear deck, a Druid deck, a Saproling deck, a Soldier deck and so on. Furthermore, while there are many Changelings that have no other abilities, some of them do and are useful in many typal decks. With the critical mass of an all-types deck having been broken some time ago, we are moving further into uncharted waters courtesy of multiple unique cards. What does the future hold for types in Magic and are the designs new, compelling and on the right track?
The Distant Past

This is an Alpha print
Goblin King


This Revised edition King shows the type changes made as Magic slightly altered the card. No longer a Goblin, the King was merely a Lord and nothing else. This is how the game was until…

So yes, it only made sense that Goblin King would be an actual Goblin, and if you wanted it to not buff itself you merely had to write “other Goblins” for that to happen. Yes, it took them years to make this change but it was the start. Mirrodin was where they focused on the class/type format as the new way forward.
Another huge event called “The Grand Creature Type Update” in 2007 sought to fix all the past weird creature types, corner cases, and other rules associated with creatures of a typal nature. Gone were the days of “Summon
Uncle Istvan

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But Then Commander Happened

Commander can trace its original roots to “EDH” back as far as 1996, and regardless of the exact born on date it’s an old format. Second only to the original Elder Dragon based decks would be “theme” decks, whether typal based, mechanic-centric like milling or even artist focused.
It did not happen all at once but, gradually, Wizards has been making much more compelling and interesting choices when it comes down to type based decks. Cards like
Raphael, Fiendish Savior

Other Demons, Devils, Imps, and Tieflings you control get +1/+1 and have lifelink.
At the beginning of each end step, if a creature card was put into your graveyard from anywhere this turn, create a 1/1 red Devil creature token with "When this token dies, it deals 1 damage to any target."
understand that there are broader themes than just having the Devil type. Oftentimes you will want a mix of Demons and Imps from throughout Magic’s history for both flavor and power reasons. But Raphael also includes the various Dungeons and Dragons sets which have added Tieflings for additional, new variety. Any card that is trying to work in a typal nature generally needs to accept that Magic has a vast card pool over 30 years old. If it does not it will end up as a far more limited and stale card. Speaking of vast interaction…
This is Where we were Heading

Morophon, the Boundless

As Morophon enters, choose a creature type.
Spells of the chosen type you cast cost {W}{U}{B}{R}{G} less to cast. This effect reduces only the amount of colored mana you pay.
Other creatures you control of the chosen type get +1/+1.
is an awesome card, terrifyingly awesome in fact. Because it is every creature type, it allows you to easily select it as a commander for every existing creature type in Magic now… but also in the future as well. That’s the problem. If Magic makes a new creature type, you already have a very compelling choice for your commander in Morophon. Furthermore, the minimum viable product must be at least as good as Morophon or you might as well play Morophon, right? With a template of Morophon and forty other Changelings, you have a minimum threshold that every printed card must cross not only for power but also simple functionality. It’s one thing to compare
Grizzly Bears


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Wizards has been Doing Their Homework

Embiggen


Right now Rukumarel, Biologist is not seeing huge play, but this card is an excellent sign for the future. As a five color commander that remixes your creatures into Slivers, the upper limit of this card is massive. One of the strongest potential cards to join Rukumarel is undoubtedly
Hatchery Sliver

Each Sliver spell you cast has replicate. The replicate cost is equal to its mana cost. (A copy of a permanent spell becomes a token.)
. It doesn’t take long to think about naming Thopter and replicating an infinite number of
Ornithopter



Finally another, future, example is the new Doctor Who set’s Doctor’s Companion keyword. The way the mechanic works is just a bit different than the Partner mechanic, or the Friends Forever mechanic. Evidently it’s type based but with a twist as you can read from Gavin Verhey’s post here. You must be any Time Lord Doctor with a Doctor’s Companion keyword to use them both as commanders, but the Time Lord Doctor cannot have any other types. This allows the set companions to be mixed with all the different doctors so that there is a much larger amount of potential combinations than Partner With which thematically follows for Doctor Who. Wizards clearly wanted to showcase that specific types mattered and they were willing to make up a new mechanic unique to this set alone.
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A Bright Future, a Fine Line

A fairly popular new commander from Lord of the Rings
Lord of the Nazgul

Wraiths you control have protection from Ring-bearers.
Whenever you cast an instant or sorcery spell, create a 3/3 black Wraith creature token with menace. Then if you control nine or more Wraiths, Wraiths you control have base power and toughness 9/9 until end of turn.
received a lot of help from the set itself. With the ability to run up to nine
Nazgul

When this creature enters, the Ring tempts you.
Whenever the Ring tempts you, put a +1/+1 counter on each Wraith you control.
A deck can have up to nine cards named Nazgûl.
you see every deck submitted to EDHREC has chosen to do so, and why wouldn’t you? It’s thematic and powerful at the same time and there are a lot of new Wraiths in the set. However 35% of decks, a fairly high amount, are running
Changeling Outcast

This creature can't block and can't be blocked.
to up your Wraith count alongside other changelings.
This deck itself walks this fine line of only really including enough extra “Wraiths” with decent enough abilities, via Changelings, to give the deck critical mass without relying on the same few cards that could go into many decks. Of course, Wizards did their part making sure that there were enough building blocks to not be forced to include too many non-thematic cards purely on a numbers level. More and more cards are being printed where type is an ability worth talking about as well as plenty of newer cards featuring three types as a new gold standard instead of two. Just don’t bring up
Baral and Kari Zev

Whenever you cast your first instant or sorcery spell each turn, you may cast a spell with lesser mana value that shares a card type with it from your hand without paying its mana cost. If you don't, create First Mate Ragavan, a legendary 2/1 red Monkey Pirate creature token. It gains haste until end of turn.
as it’s obviously a misprint, right Wizards?
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