If you're curious about what those archetypes are, you can find them all here alongside some key cards to look out for.

White-Blue Flying
Falcons, faeries, and feathered folk of all forms are the faces of the flying deck. Fliers are an easy way to get damage past your opponent's creatures, so focus on aggressive creatures that can close out the game. A card like Healer's Hawk may look innocuous, but a one-mana flier that gains life is just what this deck needs.

Blue-Black Graveyard
Just because something has gone to the graveyard doesn't mean it's gone for good. Sometimes, dead is better when you're playing blue-black. Churn through your deck as you draw and discard cards. Then, utilize those cards you discarded with creatures like Dreadwing Scavenger or Soul-Shackled Zombie.

Black-Red Raid
Charge! Barrel down on your foes with an unstoppable horde of red and black creatures. Several cards in this color pair have the raid ability word, which cares about if you've attacked this turn. This is one of the most aggressive decks in Foundations, so keep an eye out for cards that can clear a path forward like Gorehorn Raider.

Red-Green Power
Harness unlimited power with this aggressive color pair. This archetype wants you to control creatures with a power of 4 or greater. While some cards might not have that much power, they may be able to buff another creature or make you a large token, such as Dragon Trainer.

Green-White +1/+1 Counters
Just because a creature is small doesn't mean it will stay that way. Anything can become a massive threat as green-white builds up its creatures with counters. Low-power creatures with useful abilities, such as trample on Beast-Kin Ranger, can hit hard with a stack of counters on them.

White-Black Life Gain
Not only does life gain help you outlast your opponents for long enough to cast massive creatures, but it can also be spun into a defensive tool. Several cards care about when you gain life, so a card like Dazzling Angel can trigger Fiendish Panda's ability.

Blue-Red Spells
This deck spells defeat for your opponent. Commonly referred to as a "spellslinger deck," this strategy cares about casting several instant and sorcery spells on a single turn. Some of those spells can even be cast from your graveyard. Inspiration from Beyond can be cast twice, each time returning another card and enabling powerful turns.

Black-Green Morbid
Live, die, and repeat in the black-green morbid deck. Cards with the morbid ability word care if any creature has died, whether it was your creature on an opponent's creature. You can remove an opponent's creature with the concisely named Stab, then use that creature's death to trigger Wardens of the Cycle.

Red-White Aggro
Play fast, do smash, and have a blast at your local Prerelease. Rather than working toward a singular, massive creature, this deck wants you to create a large board of small creature tokens, then buff them up with large anthems. Cat Collector will continue to procure purring pals, then give them a massive boost with Heroic Reinforcements.

Green-Blue Ramp
Mana is the backbone of Magic, and green-blue decks understand this better than anyone else. Playing out more lands allows you to cast massive creatures while also triggering effects that care about lands entering. Tatyova, Benthic Druid will swim through your deck and dive down for powerful cards. Combine her with Grow from the Ashes for a card-drawing, land-ramping, game-winning deck.

Finally, let's take a look at the ten draft archetypes.

Eerie Tempo (White-Blue)
The white and blue archetype is built around the eerie mechanic, encouraging you to play various enchantments, including Rooms, that can trigger eerie a second time. While white-blue is often a control deck, it leans more towards tempo in this set, meaning it uses its effects to get damage through to win the game more quickly. This deck is a fast to medium deck.

Eerie Control (Blue-Black)
The reason white-blue isn't the eerie control deck is because blue-black is. This deck uses similar tools to white-blue, those being lots of enchantments, but more as a means to lock down the opponent before gaining long-term control of the game. Since this archetype involves black, there's a bunch of creature removal and discard involved. This deck is a slow deck.

Sacrifice (Black-Red)
The black-red archetype in Duskmourn treads in familiar space for black-red. It creates a lot of resources and uses them as sacrifice fodder to strengthen its creatures and spells. The theme of sacrifice felt so at home in a modern horror set that it felt wrong not to have black-red return to its roots. This deck is a medium to slow deck.

Delirium Aggro (Red-Green)
The red-green archetype uses cheap creatures, many of which are artifact creatures and enchantment creatures, and attacks. A lot of them will die, as is the case in an aggro deck. The red-green archetype makes use of the delirium mechanic, fueled by your many dead creatures, to upgrade the next batch of attackers and overwhelm your opponent. This deck is a fast deck.

Survival (Green-White)
The green-white archetype plays into the survival mechanic. You'll activate your survival creatures by attacking, but when the board gets clogged, the deck has many other ways to tap your creatures, slowly whittling down your opponent. This deck is a medium to slow deck.

Reanimator (White-Black)
The black-white archetype is focused on reanimation. The deck stalls the opponent in the early-to-mid game as it gets giant creatures into the graveyard, which it then reanimates to win the game. This deck is a slow deck.

Room Control (Blue-Red)
The blue-red archetype leans the furthest into the Room subtype as opposed to some of the other archetypes that focus more on enchantments in general. This deck is a medium to slow deck.

Delirium Slow Grind (Black-Green)
The black-green archetype plays a lot of different card types to gum up the board, eventually reaching delirium. It then uses its graveyard as a resource to grind out a win. This deck is a slow deck.

Power 2 or Less Aggro (Red-White)
The red-white archetype, as usual, is an aggro deck. This deck plays a lot of small creatures and takes advantage of effects that specifically care about creatures with power 2 or less. This is a fast deck.

Manifest Dread (Green-Blue)
The green-blue archetype takes advantage of the manifest dread mechanic. It makes a lot of face-down 2/2 creatures, some of which grow into larger, nastier monsters. This deck is a medium deck.