Colorless

Yawning Portal -- You gain 1 life. (Leads to: Dungeon Level)

Dungeon Level -- Scry 1. (Leads to: Goblin Bazaar, Twisted Caverns)

Goblin Bazaar -- Create a Treasure token. (Leads to: Lost Level)

Twisted Caverns -- Target creature can't attack until your next turn. (Leads to: Lost Level)

Lost Level -- Scry 2. (Leads to: Runestone Caverns, Muiral's Graveyard)

Runestone Caverns -- Exile the top two cards of your library. You may play them. (Leads to: Deep Mines)

Muiral's Graveyard -- Create two 1/1 black Skeleton creature tokens. (Leads to: Deep Mines)

Deep Mines -- Scry 3. (Leads to: Mad Wizard's Lair)

Mad Wizard's Lair -- Draw three cards and reveal them. You may cast one of them without paying its mana cost.

+1: Venture into the dungeon. (Enter the first room or advance to the next room.)

-2: Look at the top six cards of your library. You may reveal a creature card from among them and put it into your hand. If it's legendary, you gain 3 life. Put the rest on the bottom of your library in a random order.

-7: You get an emblem with "Creatures you control have trample and haste and get +2/+2 for each differently named dungeon you've completed."

{T}, Sacrifice Fabled Passage: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. Then if you control four or more lands, untap that land.

As long as Grand Master of Flowers has seven or more loyalty counters on him, he's a 7/7 Dragon God creature with flying and indestructible.

+1: Target creature without first strike, double strike, or vigilance can't attack or block until your next turn.

+1: Search your library and/or graveyard for a card named Monk of the Open Hand, reveal it, and put it into your hand. If you search your library this way, shuffle.

Colorless

Cave Entrance -- Scry 1. (Leads to: Goblin Lair, Mine Tunnels)

Goblin Lair -- Create a 1/1 red Goblin creature token. (Leads to: Storeroom, Dark Pool)

Mine Tunnels -- Create a Treasure token. (Leads to: Dark Pool, Fungi Cavern)

Storeroom -- Put a +1/+1 counter on target creature. (Leads to: Temple of Dumathoin)

Dark Pool -- Each opponent loses 1 life and you gain 1 life. (Leads to: Temple of Dumathoin)

Fungi Cavern -- Target creature gets -4/-0 until your next turn. (Leads to: Temple of Dumathoin)

Temple of Dumathoin -- Draw a card.

Flurry of Blows -- Whenever you cast your second spell each turn, put a +1/+1 counter on Monk of the Open Hand.

Flurry of Blows -- Whenever you cast your second spell each turn, put a +1/+1 counter on Monk of the Open Hand.

+2: Draw two cards, then put a card from your hand on the bottom of your library.

-2: Create a blue Dog Illusion creature token with "This creature's power and toughness are each equal to twice the number of cards in your hand."

-10: Exchange your hand and library, then shuffle. You get an emblem with "You have no maximum hand size."

If Nissa's Chosen would die, put it on the bottom of its owner's library instead.

{T}, Pay 1 life, Sacrifice Prismatic Vista: Search your library for a basic land card, put it onto the battlefield, then shuffle.

Colorless

Trapped Entry -- Each player loses 1 life. (Leads to: Veils of Fear, Oubliette)

Veils of Fear -- Each player loses 2 life unless they discard a card. (Leads to: Sandfall Cell)

Sandfall Cell -- Each player loses 2 life unless they sacrifice a creature, artifact, or land. (Leads to: Cradle of the Death God)

Oubliette -- Discard a card and sacrifice a creature, an artifact, and a land. (Leads to: Cradle of the Death God)

Cradle of the Death God -- Create The Atropal, a legendary 4/4 black God Horror creature token with deathtouch.

+1: Creatures you control get +1/+0 and gain haste until end of turn.

0: Create a 1/1 red Devil creature token with "When this creature dies, it deals 1 damage to any target."

-6: You get an emblem with "At the end of the first combat phase on your turn, untap target creature you control. After this phase, there is an additional combat phase."