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.

Colorless

Whenever one or more creatures a player controls deal combat damage to you, that player takes the initiative.

Whenever you take the initiative and at the beginning of your upkeep, venture into Undercity. (If you're in a dungeon, advance to the next room. If you're not, enter Undercity. You can take the initiative even if you already have it.)

Colorless


You can't enter this dungeon unless you "venture into Undercity."

Secret Entrance -- Search your library for a basic land card, reveal it, put it into your hand, then shuffle. (Leads to: Forge, Lost Well)

Forge -- Put two +1/+1 counters on target creature. (Leads to: Trap!, Arena)

Lost Well -- Scry 2. (Leads to: Arena, Stash)

Trap! -- Target player loses 5 life. (Leads to: Archives)

Arena -- Goad target creature. (Leads to: Archives, Catacombs)

Stash -- Create a Treasure token. (Leads to: Catacombs)

Archives -- Draw a card. (Leads to: Throne of the Dead Three)

Catacombs -- Create a 4/1 black Skeleton creature token with menace. (Leads to: Throne of the Dead Three)

Throne of the Dead Three -- Reveal the top ten cards of your library. Put a creature card from among them onto the battlefield with three +1/+1 counters on it. It gains hexproof until your next turn. Then shuffle.